refactor(telemetry-utlis): Make MockLogger internal

[alexvy86]

Description

Warning

This is intended to go into the 2.20 release because it includes breaking changes to the legacy+alpha API surface (tracking issue: #23039). Do not merge it before that.

Removes the MockLogger class from the @alpha+@legacy API surface. It has been deprecated for external use since 2024-06-18.

Note: originally merged in #23010 and reverted in #23035 because it hadn't been announced previously as part of the breaking changes in 2.10.

Breaking Changes

• MockLogger is now removed from the @alpha+@legacy API surface, becoming only @internal.

Reviewer Guidance

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AB#22886

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

[github-actions]

🔗 No broken links found! ✅

Your attention to detail is admirable.

linkcheck output

> [email protected] ci:check-links /home/runner/work/FluidFramework/FluidFramework/docs
> start-server-and-test "npm run serve -- --no-open" 3000 check-links

1: starting server using command "npm run serve -- --no-open"
and when url "[ 'http://127.0.0.1:3000' ]" is responding with HTTP status code 200
running tests using command "npm run check-links"


> [email protected] serve
> docusaurus serve --no-open

[SUCCESS] Serving "build" directory at: http://localhost:3000/

> [email protected] check-links
> linkcheck http://localhost:3000 --skip-file skipped-urls.txt

Crawling...

Stats:
  170492 links
    1603 destination URLs
    1838 URLs ignored
       0 warnings
       0 errors