feat: add ACL config for providerS3

[LukasMod]

Summary

Adds ACL (Access Control List) configuration support to the S3 provider, allowing users to set object-level permissions for uploaded artifacts.

Test Plan

Unit tests that verifies:

• ACL: 'public-read' is included in upload params when acl is configured
• no default settings (current tests cover that)

---

Note

Adds optional acl to S3 provider config and forwards it to upload requests, with tests and docs updated.

• Provider S3:
  • Add acl?: clientS3.ObjectCannedACL to ProviderConfig in packages/provider-s3/src/lib/providerS3.ts and README.
  • Pass ACL to S3 Upload params when acl is configured.
• Tests:
  • Add unit test verifying ACL is included in upload params when acl is set.
• Docs:
  • Update packages/provider-s3/README.md and website/src/docs/configuration.md S3 options to document acl and allowed values.

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