[extension/ballast] Remove the deprecated memory ballast extension

[TylerHelmuth]

Description

This PR removes the deprecated memory ballast extension and all the logic in place in memorylimiter and service that was using it.

Link to tracking issue

Related to https://github.com/open-telemetry/opentelemetry-collector/issues/8343. I don't want to close it until the helm chart is updated.

Testing

Unit tests

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 92.23%. Comparing base (48b11ba) to head (420efda). Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10671      +/-   ##
==========================================
+ Coverage   92.22%   92.23%   +0.01%     
==========================================
  Files         409      406       -3     
  Lines       19134    19101      -33     
==========================================
- Hits        17646    17618      -28     
+ Misses       1127     1123       -4     
+ Partials      361      360       -1     

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[github-actions[bot]]

This PR was marked stale due to lack of activity. It will be closed in 14 days.

[TylerHelmuth]

So far I've only seen https://github.com/open-telemetry/opentelemetry-collector/issues/10995