Remove auditUserId and handle undefined cache config

[purplecabbage]

Description

Related Issue

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[Copilot]

Pull request overview

This PR removes the deprecated auditUserId functionality and adds defensive handling for undefined cache duration configuration values. The changes prevent potential issues when cache configuration properties are missing while simplifying the metadata handling logic.

• Removed auditUserId metadata from S3 upload operations
• Added null checks for cache duration configurations (htmlCacheDuration, jsCacheDuration, cssCacheDuration, imageCacheDuration)
• Refactored _getCacheControlConfig method to use explicit null returns when cache durations are undefined

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
lib/remote-storage.js	Removed auditUserId metadata handling and refactored cache control logic to return null when cache duration configs are undefined
test/lib/remote-storage.test.js	Added tests for undefined cache duration scenarios and updated existing test to reflect removal of auditUserId metadata

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[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.

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