ci: remove patch file and cleanup justfile

pr-checks/justfile

@@ -1,7 +1,6 @@
 # Perform all necessary steps to update the PR checks
 update-pr-checks:
     python3 -m venv env
-    env/bin/activate
+    source env/bin/activate
     pip3 install ruamel.yaml
     python3 sync.py
-    git apply pr-checks.patch

pr-checks/test-proxy.patch

@@ -1,18 +0,0 @@
-diff --git a/.github/workflows/__test-proxy.yml b/.github/workflows/__test-proxy.yml
-index b6831b7a0..3be758b02 100644
---- a/.github/workflows/__test-proxy.yml
-+++ b/.github/workflows/__test-proxy.yml
-@@ -45,6 +45,13 @@ jobs:
-           python-version: '3.11'
-       - name: Check out repository
-         uses: actions/checkout@v4
-+      - name: Set up GitHub CLI
-+        run: |
-+          curl -fsSL https://cli.github.com/packages/githubcli-archive-keyring.gpg | sudo dd of=/usr/share/keyrings/githubcli-archive-keyring.gpg
-+          sudo apt-key add /usr/share/keyrings/githubcli-archive-keyring.gpg
-+          sudo apt-add-repository https://cli.github.com/packages
-+          sudo apt-get update
-+          sudo apt-get install gh
-       - name: Prepare test
-         id: prepare-test
-         uses: ./.github/actions/prepare-test