fix(appsync): appsync Event API integration assertion tests

[kwwendt]

Reason for this change

Improved assertion tests for newly added AppSync Event API + Channel namespace constructs. Improved documentation to show no channel namespace is created by default, one must be explicitly defined.

Description of changes

• Added assertions to the following integration tests:
  • integ.appsync-event-api.ts
  • integ.appsync-eventapi-api-key-auth.ts
  • integ.appsync-eventapi-cognito-auth.ts
  • integ.appsync-eventapi-grants.ts
  • integ.appsync-eventapi-iam-auth.ts
  • integ.appsync-eventapi-lambda-auth.ts

To validate Cognito authorization, I needed to include the following package @aws-sdk/client-cognito-identity-provider which is why yarn.lock is updated in this PR.

• Added channel namespace usage to all Event API examples in README.md.

Describe any new or updated permissions being added

N/A

Description of how you validated changes

Integration tests all run successfully with passed assertion tests.

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

---

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

[aws-cdk-automation]

(This review is outdated)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.21%. Comparing base (e07a89c) to head (475f6f0).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #33572   +/-   ##
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  Coverage   82.21%   82.21%           
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  Files         119      119           
  Lines        6876     6876           
  Branches     1162     1162           
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  Hits         5653     5653           
  Misses       1120     1120           
  Partials      103      103           

Flag	Coverage Δ
suite.unit	82.21% <ø> (ø)

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Components	Coverage Δ
packages/aws-cdk	∅ <ø> (∅)
packages/aws-cdk-lib/core	82.21% <ø> (ø)

[GavinZZ]

Amazing, thank you for adding assertions!

[GavinZZ]

Adding a do-not-merge as pending a review from the AppSec security team.

✅ Updated pull request passes all PRLinter validations. Dismissing previous PRLinter review.

[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 475f6f0
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

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