Fix group roles not showing

[priya-tik]

Fixes issue #1201: Selected roles were not showing in the Group Details "Roles" tab even though they were correctly assigned.

[github-actions]

Hi @priya-tik
Thank you for contributing to the Opencast Admin UI.
We noticed that you have not yet filed an Individual Contributor License Agreement. Doing that (once) helps us to ensure that Opencast stays free for all. If you make your contribution on behalf of an institution, you might also want to file a Corporate Contributor License Agreement (giving you as individual contributor a bit more security as well). It can take a while for this bot to find out about new filings, so if you just filed one or both of the above do not worry about this message!
Please let us know if you have any questions regarding the CLA.

[github-actions]

Use docker or podman to test this pull request locally.

Run test server using develop.opencast.org as backend:

podman run --rm -it -p 127.0.0.1:3000:3000 ghcr.io/opencast/opencast-admin-interface:pr-1207

Specify a different backend like stable.opencast.org:

podman run --rm -it -p 127.0.0.1:3000:3000 -e PROXY_TARGET=https://stable.opencast.org ghcr.io/opencast/opencast-admin-interface:pr-1207

It may take a few seconds for the interface to spin up.
It will then be available at http://127.0.0.1:3000.
For more options you can pass on to the proxy, take a look at the README.md.

[priya-tik]

@Arnei could you please add the appropriate label(s) to this issue/PR? Thank you!

[github-actions]

This pull request is deployed at test.admin-interface.opencast.org/1207/2025-05-21_21-25-08/ .
It might take a few minutes for it to become available.

[priya-tik]

@Arnei I’ve signed the ICLA but haven’t received any confirmation yet. Could you please let me know who is responsible for approving the ICLA, or if there’s anything else I need to do from my side?

Thanks in advance!

[Arnei]

I do not personally know who at Apereo is responsible for approving ICLAs. But I know they usually don't refuse anyone, it just takes them a bit of time to accept, and then a bit more for our automated checks to pick up on that.

[NadiaUoM]

This PR commits content the fix for below PR's as well:

#1204
#1200
#1197

[stefanosgeo]

This is working, but when you click on a listed role to remove it and then hit Save, the error message 'The group could not be saved' appears.

[github-actions]

This pull request has conflicts ☹
Please resolve those so we can review the pull request.
Thanks.

[snoesberger]

Be aware that PR #1256 is also fixing this issue (besides issue #1237).

[Arnei]

Seeing as PR #1256 already fixed the issue this was addressing, this can be closed. Still, thanks for working on this priya-tik!