Today, if a PR has the autosubmit label but does not meet the required two flutter hackers approving, the bot will comment an explanatory message and remove the autosubmit label. However, if the PR laters gets the required approvals, someone will have to re-add the autosubmit label. Instead, the bot should never remove the label, so that once a PR with the label receives the required approvals, the bot will merge it.