Remove MockLogger from public API surface

[alexvy86]

Removed APIs

• The (legacy+alpha) MockLogger class in @fluidframework/telemetry-utils

Context

The MockLogger class exposed in the legacy+alpha API surface of the @fluidframework/telemetry-utils package was deprecated in June 2024. This class was intended for testing, so we don't expect anybody to have been using it in production code.

We did the removal in #23010 but reverted it in #23035 because it hadn't been announced previously as part of the breaking changes in 2.10.

Approach

No replacement will be provided. Consumers were encouraged to just reimplement it if necessary.

Dependencies

N/A

Compatibility Concerns

N/A

Phases

The only pending step is removing the class from the public API surface.

Expected Timeline

Expected to be removed in FF 2.20.0.

Open Questions

N/A