docs(python): document OTEL_SEMCONV_STABILITY_OPT_IN

[hamzarauf1]

Summary

Adds a Semantic convention stability section to the Python Instrumentation
docs for the OTEL_SEMCONV_STABILITY_OPT_IN environment variable (HTTP,
database, and GenAI values).

Fixes #11386

Test plan

• Confirmed values against Python contrib implementation
• Local format / markdown / spelling / text checks passed

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• ✅ login: hamzarauf1 / name: Hamza Rauf (9284130)

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[tammy-baylis-swi]

Thank you, I think this looks good!

We should hold on merging this until these readthedocs updates are merged first:

• Document OTEL_SEMCONV_STABILITY_OPT_IN environment variable opentelemetry-python-contrib#4254
• docs: document OTEL_SEMCONV_STABILITY_OPT_IN in database instrumentations opentelemetry-python-contrib#4993