fix(redshift-alpha): use same role for database-query singleton function

[5d]

Issue # (if applicable)

Closes #32089.

Reason for this change

The Redshift tables use a singleton function as the invoker for various custom resource onEvent Lambda functions. Currently, each custom resource lambda function has a dedicated IAM role to assume. However, since it’s the same singleton function, a shared role could achieve the same outcome.

Description of changes

Use the same IAM role for the singleton invoker function to assume.

Description of how you validated changes

deployed to my local stack

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.77%. Comparing base (2e75924) to head (e89b32b).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #32363   +/-   ##
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  Coverage   78.77%   78.77%           
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  Files         108      108           
  Lines        7162     7162           
  Branches     1320     1320           
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  Hits         5642     5642           
  Misses       1335     1335           
  Partials      185      185           

Flag	Coverage Δ
suite.unit	78.77% <ø> (ø)

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Components	Coverage Δ
packages/aws-cdk	78.77% <ø> (ø)

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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: e89b32b
• Result: SUCCEEDED
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