Feature request: extend valid-title to include tags

[aaron-goff]

Use case: We often use an @new tag when writing new tests to help us focus down on just running those new tests, before removing the tag prior to creating our PRs.

It makes most sense to me to extend the valid-title rule to include support for this, possibly with a disallowedTags option? I can see it also being it's own rule if that makes more sense.

...
        'playwright/valid-title': [
          'error',
          {
            disallowedTags: ['@new']
          }
        ],
...