Remove ready_for_review triggers from workflows

.github/actions/prepare-mergeback-branch/action.yml

@@ -91,18 +91,15 @@ runs:
 
           Please do the following:
 
-          - [ ] Mark the PR as ready for review to trigger the full set of PR checks.
+          - [ ] Approve running the full set of PR checks.
           - [ ] Approve and merge the PR. When merging the PR, make sure "Create a merge commit" is
                 selected rather than "Squash and merge" or "Rebase and merge".
         EOF
         )
 
-        # PR checks won't be triggered on PRs created by Actions. Therefore mark the PR as draft
-        # so that a maintainer can take the PR out of draft, thereby triggering the PR checks.
         gh pr create \
           --head "${NEW_BRANCH}" \
           --base "${BASE_BRANCH}" \
           --title "${pr_title}" \
           --body "${pr_body}" \
-          --assignee "${GITHUB_ACTOR}" \
-          --draft
+          --assignee "${GITHUB_ACTOR}"

.github/update-release-branch.py

@@ -136,7 +136,7 @@ def open_pr(
   body.append(f' - [ ] Check that there are not any unexpected commits being merged into the `{target_branch}` branch.')
   body.append(' - [ ] Ensure the docs team is aware of any documentation changes that need to be released.')
 
-  body.append(' - [ ] Mark the PR as ready for review to trigger the full set of PR checks.')
+  body.append(' - [ ] Approve running the full set of PR checks if you have not pushed any changes.')
   body.append(' - [ ] Approve and merge this PR. Make sure `Create a merge commit` is selected rather than `Squash and merge` or `Rebase and merge`.')
 
   if is_primary_release:
@@ -146,9 +146,7 @@ def open_pr(
   title = f'Merge {source_branch} into {target_branch}'
 
   # Create the pull request
-  # PR checks won't be triggered on PRs created by Actions. Therefore mark the PR as draft so that
-  # a maintainer can take the PR out of draft, thereby triggering the PR checks.
-  pr = repo.create_pull(title=title, body='\n'.join(body), head=new_branch_name, base=target_branch, draft=True)
+  pr = repo.create_pull(title=title, body='\n'.join(body), head=new_branch_name, base=target_branch)
   print(f'Created PR #{str(pr.number)}')
 
   # Assign the conductor