[pylint] Detect nested methods correctly (PLW1641)

[InSyncWithFoo]

Summary

Resolves #14882.

Test Plan

cargo nextest run and cargo insta test.

[github-actions]

ruff-ecosystem results

Linter (stable)

✅ ecosystem check detected no linter changes.

Linter (preview)

ℹ️ ecosystem check detected linter changes. (+3 -0 violations, +0 -0 fixes in 1 projects; 54 projects unchanged)

astropy/astropy (+3 -0 violations, +0 -0 fixes)

ruff check --no-cache --exit-zero --ignore RUF9 --output-format concise --preview

+ astropy/modeling/parameters.py:113:7: PLW1641 Object does not implement `__hash__` method
+ astropy/table/bst.py:90:7: PLW1641 Object does not implement `__hash__` method
+ astropy/table/column.py:1164:7: PLW1641 Object does not implement `__hash__` method

Changes by rule (1 rules affected)

code	total	+ violation	- violation	+ fix	- fix
PLW1641	3	3	0	0	0

[MichaReiser]

I'm a bit concerned about special casing this behavior only for PLW1641. Other rules that need to inspect a class's methods, like #14688, will now have inconsistent behavior.

I wonder if we could make this more reusable so that all class method rules could profit from it. Although I'm not quiet sure how to do that.

For example, we could create a any_method function in semantic/analyze/class