Add lint rule to prevent short table delimiter rows

Problem to solve

As discussed in the related issue, we need to make sure that tables always have at least three - in the delimiter rows, otherwise the translation system could fail to parse the table correctly.

Further details

We need to prevent tables like:

• !194409 (diffs)
• https://gitlab.com/gitlab-org/gitlab/-/blob/master/doc/subscriptions/gitlab_dedicated/_index.md?ref_type=heads&plain=1#L269

Proposal

We can create a vale rule to catch and prevent these kinds of tables. Regex similar to \|$\n\| ?-{0,2}\| might work 🤔

Who can address the issue

Other links/references