Improve memory instrumentation check, re-enable spec
What does this MR do and why?
This was an action item from #384081 (closed).
Improvements:
- Always fail fast when memory instrumentation is unavailable
- Clearer name and error message
This means the test can currently not run on the GDK unless the developer manually applies these patches. This is a known issue and filed in gitlab-development-kit#1231 (closed).
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How to set up and validate locally
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MR acceptance checklist
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Related to #384081 (closed)