Enable video animations for all users

[hotzenklotz]

This PR enables the animations feature for all users and add a small example video to the modal.

Steps to test:

• None

Issues:

• Contributes to Add Render Animation Worker Job #7348

DO NOT MERGE YET

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(Please delete unneeded items, merge only when none are left open)

• Updated changelog
• Updated migration guide if applicable
• Updated documentation if applicable
• Adapted wk-libs python client if relevant API parts change
• Removed dev-only changes like prints and application.conf edits
• Considered common edge cases
• Needs datastore update after deployment

[normanrz]

Code looks good 👍
Since we only allow 2 jobs to be run in parallel and these videos take up to 12h to render. I am a bit worried that the animations will starve out other more important jobs such as data import conversion. Same problem with infer_neurons.
I think we might need to restrict these heavy jobs to only one concurrent and open up more slots for import. cc @fm3

[fm3]

Yeah, makes sense. That is now tracked in #7458