Return directly from incompatible branches

[nickdrozd]

Type of Changes

	Type
✓	🔨 Refactoring

Description

There are a few functions the do a multi-way branch on some value. They have if/elif/elif/... structure, but the branches are incompatible. This MR changes them to return directly after a match.

This should improve performance a tiny bit, since fewer branches will be checked.

Also introduces a Scope type for the NamesConsumer.

[codecov]

Codecov Report

Attention: Patch coverage is 96.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 95.80%. Comparing base (3097f0b) to head (8bdfaaa).

Files with missing lines	Patch %	Lines
pylint/checkers/variables.py	96.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9997      +/-   ##
==========================================
- Coverage   95.80%   95.80%   -0.01%     
==========================================
  Files         174      174              
  Lines       18937    18923      -14     
==========================================
- Hits        18143    18129      -14     
  Misses        794      794              

Files with missing lines	Coverage Δ
pylint/checkers/variables.py	97.24% <96.00%> (+0.04%)	⬆️

... and 1 file with indirect coverage changes

[github-actions]

🤖 According to the primer, this change has no effect on the checked open source code. 🤖🎉

This comment was generated for commit 8bdfaaa

[nickdrozd]

One line is uncovered, but it was already uncovered.