feat(kinesisfirehose): support S3 file extension format

[Tietew]

Issue # (if applicable)

Closes #32154.

Reason for this change

The file extension can be overridden by specifying FileExtension.
For details, see S3 file extension format (optional) in Configure destination settings for Amazon S3

Description of changes

Added fileExtension prop to S3BucketProps.

Describe any new or updated permissions being added

N/A

Description of how you validated changes

Added unit tests and updated an integ test to include fileExtension.

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 82.39%. Comparing base (d8bbc1c) to head (b5802b9).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #33776   +/-   ##
=======================================
  Coverage   82.39%   82.39%           
=======================================
  Files         120      120           
  Lines        6960     6960           
  Branches     1175     1175           
=======================================
  Hits         5735     5735           
  Misses       1120     1120           
  Partials      105      105           

Flag	Coverage Δ
suite.unit	82.39% <ø> (ø)

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Components	Coverage Δ
packages/aws-cdk	∅ <ø> (∅)
packages/aws-cdk-lib/core	82.39% <ø> (ø)

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[paulhcsun]

@Mergifyio update

[mergify]

update

☑️ Nothing to do

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[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: b5802b9
• Result: SUCCEEDED
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[mergify]

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