Scope and purpose

Fixes #3821.

How to manually test:

1. Add an alias to a room, another to a location. Add that location as a child to another location.
2. Search for the alias in the search bar on top of every page. See that you're redirected to the detail page of the room/the location.
3. Search for the alias of the room in the room search /search/room/. See that that room is listed in the result.
4. Search for the alias of the location in the room search /search/room/. See that all the rooms that are in that location are listed.
5. Search for the alias of the location in the location search /search/location/. See that both the location and it's parent are listed.

Contributor Checklist

Every pull request should have this checklist filled out, no matter how small it is.
More information about contributing to NAV can be found in the
Hacker's guide to NAV.

• Added a changelog fragment for towncrier
• Added/amended tests for new/changed code
• Added/changed documentation
• Linted/formatted the code with ruff, easiest by using pre-commit
• Wrote the commit message so that the first line continues the sentence "If applied, this commit will ...", starts with a capital letter, does not end with punctuation and is 50 characters or less long. See https://cbea.ms/git-commit/
• Based this pull request on the correct upstream branch: For a patch/bugfix affecting the latest stable version, it should be based on that version's branch (<major>.<minor>.x). For a new feature or other additions, it should be based on master.
• If applicable: Created new issues if this PR does not fix the issue completely/there is further work to be done
• If it's not obvious from a linked issue, described how to interact with NAV in order for a reviewer to observe the effects of this change first-hand (commands, URLs, UI interactions)
• If this results in changes in the UI: Added screenshots of the before and after
• If this adds a new Python source code file: Added the boilerplate header to that file