GitHub Actions cleanups (#24620)

- Remove actions name where command is descriptive enough
- Use kebab-case instead of snake-case for step names
- Use shorter job names because to make PR checks more readable
- Remove duplicate `checks-backend`

---------

Co-authored-by: Yarden Shoham <git@yardenshoham.com>

.github/workflows/lock.yml

@@ -1,21 +0,0 @@
-name: 'Lock Threads'
-
-on:
-  schedule:
-    - cron: '0 0 * * *' # Run once a day
-  workflow_dispatch:
-
-permissions:
-  issues: write
-  pull-requests: write
-
-concurrency:
-  group: lock
-
-jobs:
-  action:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: dessant/lock-threads@v4
-        with:
-          issue-inactive-days: 45