Mark resource auth type public

[FullStackChef]

Recreated from #7135

Make UseAccessKeyAuthentication public so that it is accessible for package extensibility

Description

When extending on the Azure.Redis package (e.g. CommunityToolkit/Aspire#371) there needs to be a way to determine early (outside of ConfigureInfrastructure) whether the Redis has been configured with AccessKeyAuthentication in order to configure appropriate parameters and outputs

Fixes # (issue)
Have not yet created an issue

Checklist

• Is this feature complete?
  • Yes. Ready to ship.
  • No. Follow-up changes expected.
• Are you including unit tests for the changes and scenario tests if relevant?
  • [] Yes
  • No
• Did you add public API?
  • Yes
    • If yes, did you have an API Review for it?
      • Yes
      • No
    • Did you add <remarks /> and <code /> elements on your triple slash comments?
      • Yes
      • No
  • No
• Does the change make any security assumptions or guarantees?
  • Yes
    • If yes, have you done a threat model and had a security review?
      • Yes
      • No
  • No
• Does the change require an update in our Aspire docs?
  • Yes
    • Is this introducing a breaking change?
      • Yes
        • Link to aspire-docs issue (please use this breaking-change template):
      • No
        • Link to aspire-docs issue (please use this doc-idea template):
  • No

[FullStackChef]

@davidfowl @eerhardt @sebastienros Apologies for mucking up the last PR (I'm used to devops and single source repos)

[davidfowl]

tks