fix: namespace setting when current is not in results

[leafty]

Fixes an issue with projects in personal namespaces where the current namespace would not be selectable.

The same issue would also exist for new groups which do not appear on the first page of results.

Other fixes:

• Fix focus border on the namespace selector
• Fix label and input id linking. Now clicking on the label focuses on the select element (can then press up or down to select a namespace).

/deploy renku=release-0.60.0

[RenkuBot]

You can access the deployment of this PR at https://renku-ci-ui-3388.dev.renku.ch

[lorenzo-cavazzi]

Lgtm! 🚀

[RenkuBot]

Tearing down the temporary RenkuLab deplyoment for this PR.