Redesign user task list

[daniel-wer]

This PR replaces the user task list table with a list of "cards". This makes it easier to read the whole description of a task and doesn't break long project/task-type names. Let's wait for feedback and refine accordingly

URL of deployed dev instance (used for testing):

• https://redesignusertasklist.webknossos.xyz

Steps to test:

• Create and get some tasks, so the user task list is populated.
• Check whether the user task list is rendered correctly, the description is fully readable and the actions still work.
• The list with the finished tasks and the admin view for a users tasks (Users - Show Tracings) should look the same, but the description should be restricted in height, to allow for better readability when scanning many tasks.

Issues:

• fixes Redesign user task list #2817

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• Ready for review

[jstriebel]

@daniel-wer: Please remember to add the change notes to the changelog ;)

[philippotto]

Sweet! Looks really good! I pushed some minor design tweaks, since I figured it would be faster than describing it here :)

Looks like this now:

[philippotto]

Ok, now I see that Alexander wanted description and buttons switched around. I also took the liberty to do this 🙈

[daniel-wer]

@philippotto Thanks for getting this PR finalized. I'll merge as soon as CI is done.