Run the test compatibility check even if tests failed (#5879)

This forces the test compatibility check to run, even if compatibility
test checks have failed, as having it skipped still allows merging PRs.

Related:
open-telemetry/opentelemetry-go-contrib#6224

.github/workflows/ci.yml

@@ -168,6 +168,7 @@ jobs:
   test-compatibility:
     runs-on: ubuntu-latest
     needs: [compatibility-test]
+    if: always()
     steps:
       - name: Test if compatibility-test passed
         run: |