[5.3] Tags: Fix broken aliases in routing

[Hackwar]

Pull Request for Issue #42208.

Summary of Changes

The tags router currently does not fix incomplete URL parts like other components. Specifically it does not look up the alias for tags which were only references by an ID and didn't have the slug like expected. The code also unifies the IDs to be arrays as expected.

Testing Instructions

Look up the ID of a tag of your choice which isn't directly linked via a menu item. Go into an article of your choosing and insert the following:

<a href="index.php?option=com_tags&view=tag&id=5">Test</a>

Adapt the &id=5 to the ID of your chosen tag.

Actual result BEFORE applying this Pull Request

The URL will look something like this: `http://domain.tld/tags-component/all-tags/5.html

Expected result AFTER applying this Pull Request

The URL will look something like this: `http://domain.tld/tags-component/all-tags/lime.html

Link to documentations

Please select:

• Documentation link for docs.joomla.org:

• No documentation changes for docs.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed