Identify users using their remote ID

[qwerty287]

do not use login name as primary ID when logging in

This can be extended later to support changing usernames etc.

[anbraten]

Nice change.

[codecov-commenter]

Codecov Report

Patch coverage: 31.11% and project coverage change: -0.07 ⚠️

Comparison is base (f3074dd) 39.26% compared to head (fc2baf5) 39.20%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1732      +/-   ##
==========================================
- Coverage   39.26%   39.20%   -0.07%     
==========================================
  Files         169      169              
  Lines       10815    10831      +16     
==========================================
- Hits         4247     4246       -1     
- Misses       6292     6309      +17     
  Partials      276      276              

Impacted Files	Coverage Δ
server/forge/gitea/gitea.go	30.49% <0.00%> (-0.08%)	⬇️
server/forge/github/github.go	13.48% <0.00%> (-0.04%)	⬇️
server/forge/gitlab/gitlab.go	18.52% <0.00%> (-0.04%)	⬇️
server/forge/gogs/gogs.go	47.57% <0.00%> (-0.24%)	⬇️
server/model/user.go	66.66% <ø> (ø)
server/store/datastore/user.go	58.53% <27.27%> (-12.44%)	⬇️
server/forge/bitbucket/convert.go	97.56% <100.00%> (+0.01%)	⬆️
server/forge/bitbucketserver/convert.go	85.89% <100.00%> (+0.18%)	⬆️

... and 1 file with indirect coverage changes

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