handling reg app HTTP 404 user not found

[nurali-techie]

• handle HTTP 404 from reg_app and call userService.DeactivateUser() directly from user_deactivation_worker.
• enhance existing user_deactivation_worker test to actually trigger user_deativation during test run.
• added new test in user_deactivation_worker for 404 case.

[codecov[bot]]

Codecov Report

Merging #862 into master will increase coverage by 0.17%. The diff coverage is 57.14%.

@@            Coverage Diff             @@
##           master     #862      +/-   ##
==========================================
+ Coverage   77.96%   78.14%   +0.17%     
==========================================
  Files         100      100              
  Lines        9817     9837      +20     
==========================================
+ Hits         7654     7687      +33     
+ Misses       1596     1582      -14     
- Partials      567      568       +1

Impacted Files	Coverage Δ
...n/subscription/service/oso_subscription_service.go	81.14% <100%> (+2.01%)	:arrow_up:
...ication/account/worker/user_deactivation_worker.go	60% <40%> (+14.76%)	:arrow_up:
authentication/account/service/user.go	83.8% <0%> (+2.85%)	:arrow_up:
metric/metric.go	70.83% <0%> (+6.94%)	:arrow_up:

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[nurali-techie]

@xcoulon thanks for input, I have submitted commit 339a774, kindly have a look.

[nurali-techie]

Thanks @xcoulon @alexeykazakov for review :-)