chore(prlint): should allow revert commits (#22423)

----

### All Submissions:

* [ ] Have you followed the guidelines in our [Contributing guide?](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md)

### Adding new Unconventional Dependencies:

* [ ] This PR adds new unconventional dependencies following the process described [here](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md/#adding-new-unconventional-dependencies)

### New Features

* [ ] Have you added the new feature to an [integration test](https://github.com/aws/aws-cdk/blob/main/INTEGRATION_TESTS.md)?
	* [ ] Did you use `yarn integ` to deploy the infrastructure and generate the snapshot (i.e. `yarn integ` without `--dry-run`)?

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

tools/@aws-cdk/prlint/lint.ts

@@ -438,7 +438,7 @@ function hasLabel(pr: GitHubPr, labelName: string): boolean {
  */
  function validateTitlePrefix(pr: GitHubPr): TestResult {
   const result = new TestResult();
-  const titleRe = /^(feat|fix|build|chore|ci|docs|style|refactor|perf|test)(\([\w_-]+\))?: /;
+  const titleRe = /^(feat|fix|build|chore|ci|docs|style|refactor|perf|test|(r|R)evert)(\([\w_-]+\))?: /;
   const m = titleRe.exec(pr.title);
   result.assessFailure(
     !m,