expose endpoint to deactivate user

[xcoulon]

using mocks to verify that controller calls the UserService

also, make sure that all mocks are generated in test/generated pkg

fixes #780

• Please describe what your change is about.
• What issues does it solve? (Use autoreferencing for this)
• If you are still working on the change please prefix the pull request title with "WIP"

[xcoulon]

@alexeykazakov I fixed the problems you reported. Please let me know if you have further concerns ;)

[codecov[bot]]

Codecov Report

Merging #799 into master will decrease coverage by <.01%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #799      +/-   ##
==========================================
- Coverage   78.52%   78.52%   -0.01%     
==========================================
  Files          94       94              
  Lines        8882     8841      -41     
==========================================
- Hits         6975     6942      -33     
+ Misses       1392     1386       -6     
+ Partials      515      513       -2

Impacted Files	Coverage Δ
controller/namedusers.go	100% <100%> (ø)	:arrow_up:
...rovider/service/authentication_provider_service.go	68% <0%> (-4.9%)	:arrow_down:
wit/service/wit_service.go	95.83% <0%> (+4.52%)	:arrow_up:

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