APPS-1308 Update Apply config endpoint

[korotkov-aerospike]

1. on app startup moved instantiation on top level, reducing number of params
2. configuration manager return model.Config on read
3. make configuration manager impls private
4. (most important) on each CRUD operation call changeConfig method, that updates config, saves it and applies.
5. on reschedule leave ad-hoc jobs

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 3.77358% with 51 lines in your changes missing coverage. Please review.

Project coverage is 27.75%. Comparing base (5006ea7) to head (764a734).

Files with missing lines	Patch %	Lines
pkg/service/config_applier.go	0.00%	49 Missing ⚠️
pkg/service/restore_run.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##               v2     #243      +/-   ##
==========================================
- Coverage   29.97%   27.75%   -2.23%     
==========================================
  Files          37       39       +2     
  Lines        1948     2104     +156     
==========================================
  Hits          584      584              
- Misses       1281     1437     +156     
  Partials       83       83              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[reugn]

Does the refactoring require regenerating OpenAPI spec?