fix: redirect to newest group slug

[leafty]

Fixes #3385.

Example:

• https://renku-ci-ui-3467.dev.renku.ch/v2/groups/test-group-hello -> redirects to https://renku-ci-ui-3467.dev.renku.ch/v2/groups/test-group
• https://renku-ci-ui-3467.dev.renku.ch/v2/projects/test-group-hello/test-project -> redirects to https://renku-ci-ui-3467.dev.renku.ch/v2/projects/test-group/test-project

/deploy renku=release-0.63.0

[RenkuBot]

You can access the deployment of this PR at https://renku-ci-ui-3467.dev.renku.ch

[andre-code]

If I got it right, when a project’s namespace slug changes, it should redirect to the new one, right?

I found an example where, after changing a group slug, the project still opens with the old namespace slug. Because of this, the namespace dropdown in the project settings shows up empty and the list include the current and old namespace slug. Does this sound like something that needs fixing?

if I open the link as anonymous, it redirects as expected.

[leafty]

@andre-code this is because of 304 caching not being correct. I will try to make a fix in the backend.