feat(ecs): credentialSpecs in ContainerDefinitionOptions (aws#29085)

### Issue # (if applicable)

Closes #N/A

### Reason for this change

v2.127.0 updated the L1 construct for AWS::ECS::TaskDefinition, adding support for the property ContainerDefinitions.CredentialSpecs, [see](aws#29053). This PR adds support for CredentialSpecs property in the L2 construct used by `Ec2TaskDefinition.addContainer` method.

### Description of changes

Added property in L2 construct, updated unit test and added integration test.

### Description of how you validated changes

- [x] Unit test updated and validated
- [x] Integration test added and validated

### Checklist
- [x] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

packages/@aws-cdk-testing/framework-integ/test/aws-ecs/test/integ.task-definition-container-credentialspecs.js.snapshot/aws-ecs-task-definition-container-credentialspecs.template.json

@@ -0,0 +1,255 @@
+{
+ "Resources": {
+  "bucket43879C71": {
+   "Type": "AWS::S3::Bucket",
+   "Properties": {
+    "BucketEncryption": {
+     "ServerSideEncryptionConfiguration": [
+      {
+       "ServerSideEncryptionByDefault": {
+        "SSEAlgorithm": "AES256"
+       }
+      }
+     ]
+    },
+    "PublicAccessBlockConfiguration": {
+     "BlockPublicAcls": true,
+     "BlockPublicPolicy": true,
+     "IgnorePublicAcls": true,
+     "RestrictPublicBuckets": true
+    }
+   },
+   "UpdateReplacePolicy": "Delete",
+   "DeletionPolicy": "Delete"
+  },
+  "bucketPolicy638F945D": {
+   "Type": "AWS::S3::BucketPolicy",
+   "Properties": {
+    "Bucket": {
+     "Ref": "bucket43879C71"
+    },
+    "PolicyDocument": {
+     "Statement": [
+      {
+       "Action": "s3:*",
+       "Condition": {
+        "Bool": {
+         "aws:SecureTransport": "false"
+        }
+       },
+       "Effect": "Deny",
+       "Principal": {
+        "AWS": "*"
+       },
+       "Resource": [
+        {
+         "Fn::GetAtt": [
+          "bucket43879C71",
+          "Arn"
+         ]
+        },
+        {
+         "Fn::Join": [
+          "",
+          [
+           {
+            "Fn::GetAtt": [
+             "bucket43879C71",
+             "Arn"
+            ]
+           },
+           "/*"
+          ]
+         ]
+        }
+       ]
+      }
+     ],
+     "Version": "2012-10-17"
+    }
+   }
+  },
+  "parameter76C24FC7": {
+   "Type": "AWS::SSM::Parameter",
+   "Properties": {
+    "Type": "String",
+    "Value": "Sample CredSpec"
+   }
+  },
+  "taskexecutionrole7BB27090": {
+   "Type": "AWS::IAM::Role",
+   "Properties": {
+    "AssumeRolePolicyDocument": {
+     "Statement": [
+      {
+       "Action": "sts:AssumeRole",
+       "Effect": "Allow",
+       "Principal": {
+        "Service": "ecs-tasks.amazonaws.com"
+       }
+      }
+     ],
+     "Version": "2012-10-17"
+    },
+    "ManagedPolicyArns": [
+     {
+      "Fn::Join": [
+       "",
+       [
+        "arn:",
+        {
+         "Ref": "AWS::Partition"
+        },
+        ":iam::aws:policy/service-role/AmazonECSTaskExecutionRolePolicy"
+       ]
+      ]
+     },
+     {
+      "Fn::Join": [
+       "",
+       [
+        "arn:",
+        {
+         "Ref": "AWS::Partition"
+        },
+        ":iam::aws:policy/AmazonS3ReadOnlyAccess"
+       ]
+      ]
+     }
+    ],
+    "RoleName": "aws-ecs-task-definition-container-credentialspecs-task-exec-role"
+   }
+  },
+  "TaskDefTaskRole1EDB4A67": {
+   "Type": "AWS::IAM::Role",
+   "Properties": {
+    "AssumeRolePolicyDocument": {
+     "Statement": [
+      {
+       "Action": "sts:AssumeRole",
+       "Effect": "Allow",
+       "Principal": {
+        "Service": "ecs-tasks.amazonaws.com"
+       }
+      }
+     ],
+     "Version": "2012-10-17"
+    }
+   }
+  },
+  "TaskDef54694570": {
+   "Type": "AWS::ECS::TaskDefinition",
+   "Properties": {
+    "ContainerDefinitions": [
+     {
+      "CredentialSpecs": [
+       {
+        "Fn::Join": [
+         "",
+         [
+          "credentialspec:arn:",
+          {
+           "Ref": "AWS::Partition"
+          },
+          ":ssm:",
+          {
+           "Ref": "AWS::Region"
+          },
+          ":",
+          {
+           "Ref": "AWS::AccountId"
+          },
+          ":parameter/",
+          {
+           "Ref": "parameter76C24FC7"
+          }
+         ]
+        ]
+       }
+      ],
+      "Essential": true,
+      "Image": "public.ecr.aws/ecs-sample-image/amazon-ecs-sample:latest",
+      "Memory": 512,
+      "MemoryReservation": 32,
+      "Name": "DomainJoinedContainer"
+     },
+     {
+      "CredentialSpecs": [
+       {
+        "Fn::Join": [
+         "",
+         [
+          "credentialspecdomainless:",
+          {
+           "Fn::GetAtt": [
+            "bucket43879C71",
+            "Arn"
+           ]
+          },
+          "/credSpecDomainless"
+         ]
+        ]
+       }
+      ],
+      "Essential": true,
+      "Image": "public.ecr.aws/ecs-sample-image/amazon-ecs-sample:latest",
+      "Memory": 512,
+      "MemoryReservation": 32,
+      "Name": "DomainlessContainer"
+     }
+    ],
+    "ExecutionRoleArn": {
+     "Fn::GetAtt": [
+      "taskexecutionrole7BB27090",
+      "Arn"
+     ]
+    },
+    "Family": "awsecstaskdefinitioncontainercredentialspecsTaskDefE15276BC",
+    "NetworkMode": "bridge",
+    "RequiresCompatibilities": [
+     "EC2"
+    ],
+    "TaskRoleArn": {
+     "Fn::GetAtt": [
+      "TaskDefTaskRole1EDB4A67",
+      "Arn"
+     ]
+    }
+   }
+  }
+ },
+ "Parameters": {
+  "BootstrapVersion": {
+   "Type": "AWS::SSM::Parameter::Value<String>",
+   "Default": "/cdk-bootstrap/hnb659fds/version",
+   "Description": "Version of the CDK Bootstrap resources in this environment, automatically retrieved from SSM Parameter Store. [cdk:skip]"
+  }
+ },
+ "Rules": {
+  "CheckBootstrapVersion": {
+   "Assertions": [
+    {
+     "Assert": {
+      "Fn::Not": [
+       {
+        "Fn::Contains": [
+         [
+          "1",
+          "2",
+          "3",
+          "4",
+          "5"
+         ],
+         {
+          "Ref": "BootstrapVersion"
+         }
+        ]
+       }
+      ]
+     },
+     "AssertDescription": "CDK bootstrap stack version 6 required. Please run 'cdk bootstrap' with a recent version of the CDK CLI."
+    }
+   ]
+  }
+ }
+}