fix(instance): delete sbs volumes on instance termination

[Mia-Cross]

Closes #4676

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 73.33333% with 12 lines in your changes missing coverage. Please review.

Project coverage is 56.39%. Comparing base (5bf53e0) to head (9e83727).
Report is 692 commits behind head on master.

Files with missing lines	Patch %	Lines
...nal/namespaces/instance/v1/custom_server_action.go	73.33%	7 Missing and 5 partials ⚠️

❗ There is a different number of reports uploaded between BASE (5bf53e0) and HEAD (9e83727). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (5bf53e0)	HEAD (9e83727)
	2	1

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #4848       +/-   ##
===========================================
- Coverage   75.45%   56.39%   -19.06%     
===========================================
  Files         202      314      +112     
  Lines       44323    78391    +34068     
===========================================
+ Hits        33444    44212    +10768     
- Misses       9653    32768    +23115     
- Partials     1226     1411      +185     

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