chore(ci): Skip some tests for PRs of release-plz (#405)

It does not make sense to run benchmarks and loadtests for the release
PRs.

Author: gtema

.github/workflows/benchmark_pr.yml

@@ -18,7 +18,7 @@ env:
 jobs:
   bench_pr_branch:
     # DO NOT REMOVE: For handling Fork PRs see Pull Requests from Forks
-    if: "github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name == github.repository && github.actor != 'dependabot[bot]'"
+    if: "github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name == github.repository && github.actor != 'dependabot[bot]' && github.actor != 'openstack-experimental-release-plz'"
     permissions:
       pull-requests: write
     strategy:

.github/workflows/functional.yml

@@ -124,6 +124,7 @@ jobs:
 
   federation:
     runs-on: ubuntu-latest
+    if: "github.actor != 'openstack-experimental-release-plz'"
     needs:
       - build
     permissions:
@@ -202,6 +203,7 @@ jobs:
 
   loadtest:
     runs-on: ubuntu-latest
+    if: "github.actor != 'openstack-experimental-release-plz'"
     needs:
       - build
     permissions: