feat(instance_server): use sbs api per default for block volumes

[Codelax]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 75.00000% with 7 lines in your changes missing coverage. Please review.

Project coverage is 67.65%. Comparing base (fe86049) to head (849a06f).
Report is 223 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/services/instance/server.go	78.94%	3 Missing and 1 partial ⚠️
...ternal/services/instance/helpers_instance_block.go	62.50%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2804      +/-   ##
==========================================
- Coverage   71.43%   67.65%   -3.78%     
==========================================
  Files         277      339      +62     
  Lines       35875    39924    +4049     
==========================================
+ Hits        25628    27012    +1384     
- Misses       8028    10598    +2570     
- Partials     2219     2314      +95     

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