APPS-1268 Validate backup/restore namespace exists

[korotkov-aerospike]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 58.65385% with 43 lines in your changes missing coverage. Please review.

Project coverage is 28.73%. Comparing base (f35916d) to head (2a7162e).

Files with missing lines	Patch %	Lines
pkg/service/restore_data.go	21.73%	16 Missing and 2 partials ⚠️
pkg/dto/restore_request.go	0.00%	12 Missing ⚠️
pkg/service/client_manager.go	89.58%	4 Missing and 1 partial ⚠️
pkg/dto/backup_routine.go	40.00%	2 Missing and 1 partial ⚠️
pkg/dto/config.go	57.14%	2 Missing and 1 partial ⚠️
pkg/service/config_applier.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##               v2     #244      +/-   ##
==========================================
+ Coverage   27.75%   28.73%   +0.97%     
==========================================
  Files          39       39              
  Lines        2104     2168      +64     
==========================================
+ Hits          584      623      +39     
- Misses       1437     1457      +20     
- Partials       83       88       +5     

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[korotkov-aerospike]

I've introduced nsValidator component that does the info request and validates namespaces.
If aerospike is unavailable, validation is skipped.
I do it when the config is updated, or routine or cluster. It had added a bit of complexity, but I think it's worth it.