Migrate groups fetch to ocs api

[skjnldsv]

Use our ocs api instead of old group controller legacy in settings

I reformatted the files:
the only real change is:
https://github.com/nextcloud/server/pull/9296/files?w=1

            $.ajax({
                url: OC.linkToOCS('cloud/groups', 2) + 'details',
                dataType: 'json',
                success: function(data) {
                    var results = [];

                    if (data.ocs.data.groups && data.ocs.data.groups.length > 0) {

                        data.ocs.data.groups.forEach(function(group) {
                            if (!options.excludeAdmins || group.id !== 'admin') {
                                results.push({ id: group.id, displayname: group.displayname });
                            }
                        })

[codecov]

Codecov Report

Merging #9296 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #9296      +/-   ##
============================================
+ Coverage     51.93%   51.93%   +<.01%     
  Complexity    25389    25389              
============================================
  Files          1608     1608              
  Lines         95436    95436              
  Branches       1394     1394              
============================================
+ Hits          49563    49564       +1     
+ Misses        45873    45872       -1

Impacted Files	Coverage Δ	Complexity Δ
lib/private/Files/Cache/Propagator.php	96.2% <0%> (+1.26%)	16% <0%> (ø)	⬇️

[MorrisJobke]

Tested and works 👍

[rullzer]

Does this mean the old endpoint can die?

[nickvergessen]

It does with #8824