Adds MustChangePassword to user create/edit API

[jolheiser]

This adds the MustChangePassword field to user creation/editing via the admin API endpoints.
Defaults to true, same as CLI.

[codecov-io]

Codecov Report

Merging #6193 into master will decrease coverage by 0.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #6193      +/-   ##
==========================================
- Coverage   38.87%   38.86%   -0.02%     
==========================================
  Files         354      354              
  Lines       50192    50198       +6     
==========================================
- Hits        19513    19508       -5     
- Misses      27855    27865      +10     
- Partials     2824     2825       +1

Impacted Files	Coverage Δ
routers/api/v1/admin/user.go	21.97% <0%> (-0.5%)	⬇️
modules/process/manager.go	76.81% <0%> (-4.35%)	⬇️
models/repo_list.go	66.84% <0%> (-1.06%)	⬇️

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