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-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.33%. Comparing base (eb8d44b) to head (a1bb7a6).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1311      +/-   ##
==========================================
- Coverage   81.33%   81.33%   -0.01%     
==========================================
  Files         203      203              
  Lines       22641    22643       +2     
  Branches     3574     3575       +1     
==========================================
+ Hits        18416    18417       +1     
- Misses       3032     3035       +3     
+ Partials     1193     1191       -2     

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[github-actions]

🦙 MegaLinter status: ❌ ERROR

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
⚠️ MARKDOWN	markdownlint	19	5	14	0.96s
❌ MARKDOWN	markdown-link-check	19		12	89.21s
❌ PYTHON	ruff	yes	yes	1	0.28s
✅ RST	rstcheck	2		0	4.36s
✅ RST	rstfmt	2	1	0	1.77s
✅ RST	rst-lint	2		0	1.14s
✅ YAML	prettier	10	1	0	1.09s
✅ YAML	v8r	10		0	5.1s
✅ YAML	yamllint	10		0	0.64s

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