feat(cognito-identitypool-alpha): add addRoleMappings method

[Leo10Gama]

Issue # (if applicable)

Closes #33725

Reason for this change

Currently, there exists a circular dependency for IAM roles and Identity Pools, where the role mappings cannot be specified without an identity pool ID, but we cannot get the identity pool IDs without also creating the pool, which must be created with the role. By re-introducing the addRoleMappings method, we allow for these role mappings to be tweaked later in execution, breaking the cyclic dependency.

Description of changes

Included addRoleMappings method, which takes a list of IdentityPoolRoleMapping and overrides the existing property with these additional roles. The previous role mappings are preserved, and only appended with the additional ones.

Describe any new or updated permissions being added

N/A, as the only change here is customers now being able to add to their own role mappings.

Description of how you validated changes

Added new unit tests and integration tests; unit tests succeed via yarn build and the integration test passes via yarn integ test/integ.identitypool.js --update-on-failed, as evident by the updated snapshot.

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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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(This review is outdated)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 82.38%. Comparing base (fada917) to head (c29dce7).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #33820   +/-   ##
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  Coverage   82.38%   82.38%           
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  Files         120      120           
  Lines        6937     6937           
  Branches     1170     1170           
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  Hits         5715     5715           
  Misses       1119     1119           
  Partials      103      103           

Flag	Coverage Δ
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Components	Coverage Δ
packages/aws-cdk	∅ <ø> (∅)
packages/aws-cdk-lib/core	82.38% <ø> (ø)

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

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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: c29dce7
• Result: SUCCEEDED
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