fix(instance): wait for volumes after server deletion

[Codelax]

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Relates OR Closes #0000

Release note for CHANGELOG:

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 62.50000% with 15 lines in your changes missing coverage. Please review.

Project coverage is 70.84%. Comparing base (5bf53e0) to head (853b96f).
Report is 409 commits behind head on master.

Files with missing lines	Patch %	Lines
...nal/namespaces/instance/v1/custom_server_delete.go	60.52%	12 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4149      +/-   ##
==========================================
- Coverage   75.45%   70.84%   -4.62%     
==========================================
  Files         202      296      +94     
  Lines       44323    65731   +21408     
==========================================
+ Hits        33444    46564   +13120     
- Misses       9653    17526    +7873     
- Partials     1226     1641     +415     

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