Partially addresses #47424.

When a diff has a significant number of commits, the previous behavior would
attempt to render the Markdown on all the commit messages but only display
1000 of them. To avoid additional work, we only need to render the Markdown
on the set that is displayed.

This reverts merge request !18399

- Create a partial for limit exceeded message
- Modifies specs to adjust new scenarios

- Leave 'too many tags to search' always visible
- Add different message to the branch/tags so it states its unavailable

threshhold, a message is shown indicating we didn't perform the search

[9.5] Prevent a persistent XSS in the commit author block

See merge request gitlab/gitlabhq!2180

An upcoming update to rubocop-gitlab-security added additional
violations.

According to https://github.com/twbs/bootstrap/issues/10547 it's not
possible to have the trigger defined on the delegated element, i.e. not
defined as a data attribute.

Closes #32793