Fix false negative for multiple-statements on try... else/finally lines

[zenlyj]

Type of Changes

	Type
✓	🐛 Bug fix
	✨ New feature
	🔨 Refactoring
	📜 Docs

Description

I took a look at 5bdc221 and noticed that some inference logic got removed in format.py while refactoring to use the updated Try node. The purpose of this PR is to reintroduce the inference of else and finally line numbers to check for multiple statements on else/finally lines in a try statement.

This check is a little explicit because of how else and finally is represented in the AST, without a tree node to represent an else or finally line. However, it should work for general cases, except for unusual cases like:

try:
    pass
except:
    pass
#  this comment will prevent multiple-statements from flagging in the next line
finally: pass

Closes #9759

[github-actions]

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

This comment was generated for commit 2e5ff16

[DanielNoord]

Awesome, thanks!

I think #9907 broke your coverage workflow.

@Pierre-Sassoulas can we merge this while looking into that?

[zenlyj]

Appreciate the review! @DanielNoord