Use a custom Ruby patch to instrument memory usage [RUN ALL RSPEC] [RUN AS-IF-FOSS]

What does this MR do?

This uses a custom Ruby VM patch as described in this issue #296530 (closed) to provide a per-request/per-worker memory allocation statistics.

This also slightly refactors our way of initializing the instrumentation frameworks.

This is dependent on having:

• Omnibus changes
• CNG changes
• Updated Ruby for GitLab CI
• (potentially) Updated Ruby for GDK/GCK if needed to test locally

Manually tested

I tested the (on Feb 5th):

• logs being present for sidekiq
• logs being present for controllers
• logs being present for API
• FF being disabled do not emit any logs

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done