feat: Integrate online events

[iamareebjamal]

Fixes #4611

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[mariobehling]

New events seem to be working fine. Existing events show a line when choosing "Online".

E.g. compare https://open-event-frontend-git-fork-iamareebjamal-online-events.eventyay.vercel.app/events/16fa59c7/edit/basic-details

[iamareebjamal]

Thanks, will check.

[mariobehling]

It should be possible to publish an online event without adding URLs.
In the implementation of the PR it is not possible yet to publish an online event without adding URLs.

[iamareebjamal]

That might be a bug, but I have made it publishable without needing links. The work isn't complete since it was blocked by fossasia/open-event-server#7251

[iamareebjamal]

@mariobehling Please check now. I have not yet completed Show a tick box "Details will be shared as follows (e.g. you can share links in the session info: _Add__message___here." If the user chooses this message, display this message if the user on the public event page.

I'll do it in another PR

[codecov]

Codecov Report

Merging #5012 into development will increase coverage by 0.02%.
The diff coverage is 22.22%.

@@               Coverage Diff               @@
##           development    #5012      +/-   ##
===============================================
+ Coverage        22.66%   22.69%   +0.02%     
===============================================
  Files              485      485              
  Lines             5153     5165      +12     
  Branches            21       21              
===============================================
+ Hits              1168     1172       +4     
- Misses            3981     3989       +8     
  Partials             4        4              

Impacted Files	Coverage Δ
app/mixins/event-wizard.js	1.07% <0.00%> (-0.07%)	⬇️
app/models/event.js	53.84% <ø> (ø)
app/components/forms/wizard/basic-details-step.js	21.51% <44.44%> (+2.94%)	⬆️
app/controllers/admin/content/pages.js	0.00% <0.00%> (ø)

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[mariobehling]

Very good. I think remaining points can be done at a later time. Lets move forward.