Fix team edit API panic

[ngourdon]

fix #6777 and add tests for team API

[lafriks]

Thanks for adding tests 👍 small nit but otherwise LGTM

[codecov-io]

Codecov Report

Merging #6780 into master will increase coverage by 0.22%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #6780      +/-   ##
==========================================
+ Coverage   40.99%   41.22%   +0.22%     
==========================================
  Files         421      421              
  Lines       58054    58054              
==========================================
+ Hits        23802    23933     +131     
+ Misses      31086    30954     -132     
- Partials     3166     3167       +1

Impacted Files	Coverage Δ
routers/api/v1/org/team.go	25.58% <100%> (+21.59%)	⬆️
modules/log/router.go	90% <0%> (-2.5%)	⬇️
modules/log/event.go	64.46% <0%> (-1.53%)	⬇️
routers/api/v1/api.go	70.42% <0%> (+1.74%)	⬆️
models/org_team.go	53.24% <0%> (+2.86%)	⬆️
models/access.go	66.87% <0%> (+5.09%)	⬆️
models/unit.go	67.56% <0%> (+24.32%)	⬆️

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[techknowlogick]

@ngourdon thanks for PR :) would you be able to backport this PR to the release/v1.8 branch?