Update Smoketest codegen to be endpoint param aware (#3836)

## Motivation and Context
<!--- Why is this change required? What problem does it solve? -->
<!--- If it fixes an open issue, please link to the issue here -->
Smoketests for service were failing because the smoke test assumed that
`use_dual_stack` would be present. But the service's endpoint rules did
not use that bulit-in so it was not.

## Description
<!--- Describe your changes in detail -->
Check if the service actually uses the fips or dual stack built-ins
before adding them to the test.

## Testing
<!--- Please describe in detail how you tested your changes -->
<!--- Include details of your testing environment, and the tests you ran
to -->
<!--- see how your change affects other areas of the code, etc. -->
Did not add tests for this because the current `SmokeTestsDecoratorTest`
isn't actually working and fixing it is going to be a bit of work. Want
to get this in to unblock customer ASAP and will go back and update the
tests once they are unblocked.

## Checklist
<!--- If a checkbox below is not applicable, then please DELETE it
rather than leaving it unchecked -->
- [x] For changes to the smithy-rs codegen or runtime crates, I have
created a changelog entry Markdown file in the `.changelog` directory,
specifying "client," "server," or both in the `applies_to` key.

----

_By submitting this pull request, I confirm that you can use, modify,
copy, and redistribute this contribution, under the terms of your
choice._

---------

Co-authored-by: ysaito1001 <awsaito@amazon.com>

.changelog/smoketestcodegen.md

@@ -0,0 +1,12 @@
+---
+applies_to:
+  - aws-sdk-rust
+authors:
+  - landonxjames
+references: [smithy-rs#3836]
+breaking: false
+new_feature: false
+bug_fix: true
+---
+
+Update Smoketest codegeneration to be endpoint built-in aware.

aws/sdk-codegen/src/main/kotlin/software/amazon/smithy/rustsdk/SmokeTestsDecorator.kt

@@ -11,8 +11,10 @@ import software.amazon.smithy.model.node.ObjectNode
 import software.amazon.smithy.model.shapes.MemberShape
 import software.amazon.smithy.model.shapes.OperationShape
 import software.amazon.smithy.model.shapes.StructureShape
+import software.amazon.smithy.rulesengine.language.syntax.parameters.Parameters
 import software.amazon.smithy.rust.codegen.client.smithy.ClientCodegenContext
 import software.amazon.smithy.rust.codegen.client.smithy.customize.ClientCodegenDecorator
+import software.amazon.smithy.rust.codegen.client.smithy.endpoint.EndpointRulesetIndex
 import software.amazon.smithy.rust.codegen.client.smithy.generators.client.FluentClientGenerator
 import software.amazon.smithy.rust.codegen.core.rustlang.Attribute
 import software.amazon.smithy.rust.codegen.core.rustlang.Attribute.Companion.cfg
@@ -42,6 +44,7 @@ import software.amazon.smithy.smoketests.traits.SmokeTestCase
 import software.amazon.smithy.smoketests.traits.SmokeTestsTrait
 import java.util.Optional
 import java.util.logging.Logger
+import kotlin.jvm.optionals.getOrElse
 
 class SmokeTestsDecorator : ClientCodegenDecorator {
     override val name: String = "SmokeTests"
@@ -134,7 +137,7 @@ fun renderPrologue(
         they are disabled by default. To enable them, run the tests with
 
         ```sh
-        RUSTFLAGS="--cfg smoketests" cargo test.
+        RUSTFLAGS="--cfg smoketests" cargo test
         ```
         """,
     )
@@ -167,6 +170,17 @@ class SmokeTestsInstantiator(
     ) {
     private val model = codegenContext.model
     private val symbolProvider = codegenContext.symbolProvider
+    private val builtInParamNames: List<String> by lazy {
+        val index = EndpointRulesetIndex.of(codegenContext.model)
+        val rulesOrNull = index.endpointRulesForService(codegenContext.serviceShape)
+        val builtInParams: Parameters = (rulesOrNull?.parameters ?: Parameters.builder().build())
+        val temp: MutableList<String> = mutableListOf()
+        builtInParams.forEach { temp.add(it.builtIn.getOrElse { "" }) }
+        temp
+    }
+    private val fipsName = "AWS::UseFIPS"
+    private val dualStackName = "AWS::UseDualStack"
+    private val rc = codegenContext.runtimeConfig
 
     fun render(
         writer: RustWriter,
@@ -191,9 +205,18 @@ class SmokeTestsInstantiator(
 
         val vendorParams = AwsSmokeTestModel.getAwsVendorParams(testCase)
         vendorParams.orNull()?.let { params ->
-            rust(".region(config::Region::new(${params.region.dq()}))")
-            rust(".use_dual_stack(${params.useDualstack()})")
-            rust(".use_fips(${params.useFips()})")
+            rustTemplate(
+                ".region(#{Region}::new(${params.region.dq()}))",
+                "Region" to AwsRuntimeType.awsTypes(rc).resolve("region::Region"),
+            )
+
+            if (builtInParamNames.contains(dualStackName)) {
+                rust(".use_dual_stack(${params.useDualstack()})")
+            }
+            if (builtInParamNames.contains(fipsName)) {
+                rust(".use_fips(${params.useFips()})")
+            }
+
             params.uri.orNull()?.let { rust(".endpoint_url($it)") }
         }