collapse: prevent url change if `A` nested tag is clicked

Created by: joke2k

Removing jQuery the target of the click event is not the A tag if the user clicks on a nested tag, ignoring the preventDefault and changing the hash in the url.

What this PR does:

• Add event.delegateTarget into the check for preventDefault
• Test this behaviour

Details:

this code:

<a role="button" data-bs-toggle="collapse" class="collapsed" href="#collapse">
  <span id="nested">Clickme</span>
</a>
<div id="collapse" class="collapse"></div>

bubbles ups the default behaviour and changes the URL appending #collapse to it because the event.target is not an A tag, this let fail the check for event.preventDefault.

See on bs5:

https://github.com/twbs/bootstrap/blob/764e5298dea17e15bbcbf792204a45a761bedc0a/js/src/collapse.js#L372-L376

On bs4 jQuery did the work:

https://github.com/twbs/bootstrap/blob/a716fb03f965dc0846df479e14388b1b4b93d7ce/js/src/collapse.js#L361-L365

it happened with this commit https://github.com/twbs/bootstrap/commit/69e4d4f3ac897870e8186e22b19c5adf6043f3d4#diff-3cc7f0d8580d17c90274789ffc45552c56fed69ac7404d65e88ccccb81ffff31R378