FIX: Build correct assign tag links when using subfolders

[Drenmi]

Meta topic.

What's the problem?

The tag links added to the topic header extras aren't aware of subfolder usage, e.g. the topic URL would be generated as a vanilla /t/:id URL. The same applies to post assignments.

How does this fix it?

This change fixes that by passing the link URL through the getURL helper.

What about tests?

I searched around for tests that simulate subfolders, but couldn't find any. If anyone know these exist and can point me to them, that'd be great.

[martin-brennan]

Nice one. I did find this core test using setPrefix to test subfolder support, though I am not sure its worth the time spent to do tests for this. Up to you:

https://github.com/discourse/discourse/blob/8c0643ef942cffb3ed1ab8966a00718795ceebf9/app/assets/javascripts/discourse/tests/unit/models/email-log-test.js#L17-L43

[Drenmi]

I am not sure its worth the time spent to do tests for this.

Turns out to do this for acceptance tests is not straightforward. The hole goes quite deep. Will merge this for now and see if we can replace some of this with system tests. 🙏