Remove unused local AWS credential probe

[GrahamCampbell]

Summary

• Remove the unused SDK v2-backed local credential probe helper.
• Remove its dedicated unit test, since no runtime code imports the helper.

Validation

• npm run prettier-check
• npx prettier -c "../ROADMAP.md"
• npm run lint
• git diff --check
• npm run test:isolated

[Copilot]

Pull request overview

This PR removes an unused AWS “local credentials probe” helper and its unit test, simplifying the AWS utility surface area since nothing imports the helper at runtime.

Changes:

• Deleted lib/aws/has-local-credentials.js (unused AWS SDK v2-based helper).
• Deleted test/unit/lib/aws/has-local-credentials.test.js (dedicated unit test for the removed helper).

Reviewed changes

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

File	Description
lib/aws/has-local-credentials.js	Removes unused helper that probed AWS.S3().config.credentials.
test/unit/lib/aws/has-local-credentials.test.js	Removes unit tests for the deleted helper.

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