feat(s3objectlambda): open s3 access point arn

[tomoki10]

Issue # (if applicable)

Closes #31950 .

Reason for this change

Previously, users needed to manually construct ARN strings when using S3AccessPoint. This update exposes the S3AccessPoint ARN directly to reduce implementation effort.

Description of changes

This change makes the S3AccessPoint accessible as a property for reuse across the codebase.

Describe any new or updated permissions being added

No

Description of how you validated changes

• Added test cases to verify the newly exposed S3AccessPoint property in the existing unit test suite.

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]

The pull request linter has failed. See the aws-cdk-automation comment below for failure reasons. If you believe this pull request should receive an exemption, please comment and provide a justification.

A comment requesting an exemption should contain the text Exemption Request. Additionally, if clarification is needed add Clarification Request to a comment.

[tomoki10]

Exemption Request

Since other public properties are not documented in the Readme and integ tests.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.64%. Comparing base (0e1854d) to head (9bb014f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #32661   +/-   ##
=======================================
  Coverage   80.64%   80.64%           
=======================================
  Files         107      107           
  Lines        6996     6996           
  Branches     1290     1290           
=======================================
  Hits         5642     5642           
  Misses       1175     1175           
  Partials      179      179           

Flag	Coverage Δ
suite.unit	80.64% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
packages/aws-cdk	80.64% <ø> (ø)

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 9bb014f
• Result: SUCCEEDED
• Build Logs (available for 30 days)

Powered by github-codebuild-logs, available on the AWS Serverless Application Repository

[aws-cdk-automation]

The pull request linter fails with the following errors:

❌ Features must contain a change to a README file.
❌ Features must contain a change to an integration test file and the resulting snapshot.

PRs must pass status checks before we can provide a meaningful review.

If you would like to request an exemption from the status checks or clarification on feedback, please leave a comment on this PR containing Exemption Request and/or Clarification Request.

✅ A exemption request has been requested. Please wait for a maintainer's review.