fix(apigateway): remove deprecated apigatewayv2 from aws-apigateway module

[GavinZZ]

Issue # (if applicable)

Closes #32296

Reason for this change

As a summary, CDK aws-apigateway module had a legacy file called apigatewayv2.ts which includes CDK L1 Constructs from API Gateway V2 resource like CfnDomainNameV2. We've already moved everything here to aws-apigatewayv2 module. However, we had to keep the legacy file for backward compatibility issue and every Constructs in the file were marked as deprecated 5 years ago.

Now API Gateway team has released a new AWS resource called DomainNameV2 in API Gateway. The default CDK generated name would be CfnDomainNameV2 in aws-apigateway module but this name collides with the legacy CfnDomainNameV2 Construct from apigatewayv2.ts file (supposedly for APIGatewayV2).

This is causing the L1 generation tool to fail because the new resource by API Gateway is also caused CfnDomainNameV2.

Description of changes

Delete the deprecated apigatewayv2.ts file entirely.

Description of how you validated changes

Existing users on upgrade won't be able to deploy their template without knowing the change because the property for the APIGateway::DomainNameV2 resource is different from APIGatewayV2::DomainName resource, so the template would be non-deployable.

Verified that if existing users who use CfnDomainNameV2 from aws-apigateway module and update to use the same Construct from aws-apigatewayv2 module, it will generate the exact same output CFN template so it won't cause any resource replacement or downtime.

There's only 76 users who used CfnApiV2 from aws-apigateway module based on Analytics. All these users were on CDK V1 so if they choose to upgrade to latest version, they need to fix a bunch of breaking changes anyway.

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

BREAKING CHANGE: We will be removing deprecated APIGatewayV2 constructs from aws-apigateway module.

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.46%. Comparing base (7cc5f30) to head (40a5eb9).
Report is 1 commits behind head on main.

Additional details and impacted files

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  Coverage   77.46%   77.46%           
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  Files         105      105           
  Lines        7168     7168           
  Branches     1314     1314           
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  Hits         5553     5553           
  Misses       1433     1433           
  Partials      182      182           

Flag	Coverage Δ
suite.unit	77.46% <ø> (ø)

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Components	Coverage Δ
packages/aws-cdk	77.46% <ø> (ø)

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• Commit ID: 40a5eb9
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