CI: drop the separate python-format job

This is handled as part of the pre-commit hooks now which will also
ensure that we have the same version of ruff everywhere.

Fixes: a61c876412 ("pre-commit: drop black, use ruff-format instead")
Part-of: <https://gitlab.freedesktop.org/libinput/libinput/-/merge_requests/1259>

.gitlab-ci.yml

@@ -1075,13 +1075,6 @@ usr-bin-env-python@fedora:42:
         /bin/false
       fi
 
-python-format@fedora:42:
-  extends:
-    - .fedora-build@template
-  script:
-    - black $(git grep -l '^#!/usr/bin/env python3')
-    - git diff --exit-code || (echo "Please run Black against all Python files" && false)
-
 # A job to check we're actually running all test suites in the CI
 check-test-suites:
   extends:

.gitlab-ci/ci.template

@@ -617,13 +617,6 @@ usr-bin-env-python@{{distro.name}}:{{version}}:
         /bin/false
       fi
 
-python-format@{{distro.name}}:{{version}}:
-  extends:
-    - .{{distro.name}}-build@template
-  script:
-    - black $(git grep -l '^#!/usr/bin/env python3')
-    - git diff --exit-code || (echo "Please run Black against all Python files" && false)
-
 # A job to check we're actually running all test suites in the CI
 check-test-suites:
   extends: