Fix watcher.execute_watch

[philkra]

as titled.

[github-actions]

Following you can find the validation results for the APIs you have changed.

API	Status	Request	Response
watcher.ack_watch	🟢	1/1	1/1
watcher.activate_watch	🟢	1/1	1/1
watcher.deactivate_watch	🟢	1/1	1/1
watcher.delete_watch	🟢	2/2	2/2
watcher.execute_watch	🟢	7/7	7/7
watcher.get_watch	🟢	9/9	9/9
watcher.put_watch	🔴	29/38	38/38
watcher.query_watches	⚪	Missing test	Missing test
watcher.start	🟢	1/1	1/1
watcher.stats	🟢	1/1	1/1
watcher.stop	🟢	1/1	1/1

You can validate these APIs yourself by using the make validate target.

[github-actions]

The backport to 7.17 failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-7.17 7.17
# Navigate to the new working tree
cd .worktrees/backport-7.17
# Create a new branch
git switch --create backport-1456-to-7.17
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick --mainline 1 91e08714774302a2056a7003754c218117484ac2
# Push it to GitHub
git push --set-upstream origin backport-1456-to-7.17
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-7.17

Then, create a pull request where the base branch is 7.17 and the compare/head branch is backport-1456-to-7.17.