fix(ci): allow actions token write permission on PR

this allows actions token i.e. GITHUB_TOKEN write
permission because we need it to delete label in ok-to-test
step.

Signed-off-by: Zaki Shaikh <zashaikh@redhat.com>

Author: zakisk

.github/workflows/e2e.yaml

@@ -44,7 +44,7 @@ jobs:
     permissions:
       contents: read
       issues: write
-      pull-requests: read
+      pull-requests: write
     strategy:
       fail-fast: false
       matrix: