fix: revert to local action paths for workflow tests

GitHub Actions context variables don't work in the uses field.
Added back checkout steps for local action execution.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: vaind

.github/workflows/danger-workflow-tests.yml

@@ -14,9 +14,11 @@ jobs:
   test-danger-pr-analysis:
     runs-on: ubuntu-latest
     steps:
+      - uses: actions/checkout@v4
+
       - name: Run danger action
         id: danger
-        uses: getsentry/github-workflows/danger@${{ github.sha }}
+        uses: ./danger
 
       - name: Validate danger outputs
         env:

.github/workflows/workflow-tests.yml

@@ -13,9 +13,11 @@ jobs:
   test-updater-pr-creation:
     runs-on: ubuntu-latest
     steps:
+      - uses: actions/checkout@v4
+
       - name: Run updater action
         id: updater
-        uses: getsentry/github-workflows/updater@${{ github.sha }}
+        uses: ./updater
         with:
           path: updater/tests/sentry-cli.properties
           name: WORKFLOW-TEST-DEPENDENCY-DO-NOT-MERGE
@@ -74,9 +76,11 @@ jobs:
   test-updater-no-changes:
     runs-on: macos-latest
     steps:
+      - uses: actions/checkout@v4
+
       - name: Run updater action
         id: updater
-        uses: getsentry/github-workflows/updater@${{ github.sha }}
+        uses: ./updater
         with:
           path: updater/tests/workflow-args.sh
           name: Workflow args test script