Fix attendees avatars

[tcitworld]

Works when you add new attendees, but still needs work to fetch existing ones when loading the event editor.

Also fixes useless calls to user status if attendee if not an user.

Fixes https://github.com/nextcloud/calendar/issues/3099

[codecov[bot]]

Codecov Report

Patch coverage: 29.62% and project coverage change: +0.01 :tada:

Comparison is base (8e98722) 22.59% compared to head (5662542) 22.60%.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #3101      +/-   ##
============================================
+ Coverage     22.59%   22.60%   +0.01%     
- Complexity      373      374       +1     
============================================
  Files           236      236              
  Lines         11475    11495      +20     
  Branches       2149     2150       +1     
============================================
+ Hits           2593     2599       +6     
- Misses         8882     8896      +14     

Flag	Coverage Δ
javascript	14.04% <29.62%> (+0.01%)	:arrow_up:
php	63.93% <ø> (+<0.01%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/components/Editor/Invitees/InviteesList.vue	0.00% <0.00%> (ø)
...rc/components/Editor/Invitees/InviteesListItem.vue	0.00% <0.00%> (ø)
.../components/Editor/Invitees/InviteesListSearch.vue	0.00% <0.00%> (ø)
...c/components/Editor/Invitees/OrganizerListItem.vue	0.00% <ø> (ø)
src/store/contacts.js	70.00% <47.05%> (-30.00%)	:arrow_down:

... and 1 file with indirect coverage changes

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[sazanof]

Hello! I would like to ask. I am currently working on attachments in a parallel branch https://github.com/nextcloud/calendar/pull/4251#discussion_r919033226 . According to the CalDAV specification, we can use our own parameters: ex X-NC-ATTENDEE-PHOTO (May be it will be usefull)

So, can the avatar url parameter be passed when adding a user? In my case its look like this in .ics file: