Add attribute check

[lrafeei]

This PR adds an attribute check for the GC runtime metrics check.

settings.gc_runtime_metrics is of type GCRuntimeMetricsSettings() and this inherits from Settings()
global_settings() uses TopLevelSettings() which also inherits from Settings()

global_settings may not necessarily have access to the gc_runtime_metrics and these instances result in an attribute error for this enable check.

[github-actions]

🦙 MegaLinter status: ❌ ERROR

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
❌ PYTHON	ruff	1	0	1	0.06s

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.30%. Comparing base (9429694) to head (d18f9b5).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1311      +/-   ##
==========================================
+ Coverage   80.24%   81.30%   +1.05%     
==========================================
  Files         203      203              
  Lines       22499    22501       +2     
  Branches     3560     3561       +1     
==========================================
+ Hits        18054    18294     +240     
+ Misses       3312     3020     -292     
- Partials     1133     1187      +54     

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