Only return JSON for add/remove all team repos

[jolheiser]

Fixes #9023

[codecov-io]

Codecov Report

Merging #9028 into master will decrease coverage by 0.03%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #9028      +/-   ##
==========================================
- Coverage   41.13%   41.09%   -0.04%     
==========================================
  Files         549      549              
  Lines       71454    71458       +4     
==========================================
- Hits        29392    29369      -23     
- Misses      38347    38371      +24     
- Partials     3715     3718       +3

Impacted Files	Coverage Δ
routers/org/teams.go	0% <0%> (ø)	⬆️
models/repo_mirror.go	2.27% <0%> (-11.37%)	⬇️
modules/avatar/avatar.go	48% <0%> (-6%)	⬇️
models/unit.go	62.16% <0%> (-5.41%)	⬇️
models/pull_list.go	57.74% <0%> (-2.12%)	⬇️
modules/migrations/migrate.go	23.78% <0%> (-1.63%)	⬇️
services/mirror/mirror.go	18.7% <0%> (-1.08%)	⬇️
models/repo_list.go	73.14% <0%> (-0.93%)	⬇️
routers/repo/view.go	38.59% <0%> (-0.88%)	⬇️
modules/migrations/gitea.go	8.82% <0%> (-0.64%)	⬇️
... and 3 more

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[guillep2k]

Does this need backport?

[jolheiser]

No, it's new to 1.11.0