[GitHub] Remove libclang Python actions fork protection

Remove the check that only allows the action to run if
it is running from the parent llvm organization repo.
This is meant to protect contributors that fork the
project from automatically launching actions with their
account quota.

This shouldn't be necessary, since GitHub Actions are
disabled automatically on forks. The following docs says
"When a public repository is forked, scheduled workflows
are disabled by default.".

https://docs.github.com/en/actions/using-workflows/disabling-and-enabling-a-workflow

Issue #76601.

Author: linux4life798

.github/workflows/libclang-python-tests.yml

@@ -28,7 +28,6 @@ concurrency:
 
 jobs:
   check-clang-python:
-    if: github.repository_owner == 'llvm'
     # Build libclang and then run the libclang Python binding's unit tests.
     name: Build and run Python unit tests
     uses: ./.github/workflows/llvm-project-tests.yml