fix: finalize even when exiting contextmanager by exception

[irreg]

Contextmanager does not process the finalize process in try-finally and may not execute when exiting contextmanager with an error.
Unintended results were observed due to the different state of the file from the application using LSP.

from contextlib import contextmanager


@contextmanager
def sample():
    try:
        yield
        print("a")
    finally:
        print("b")

with sample():
    raise Exception # Show only b

[irreg]

@microsoft-github-policy-service agree