refactor(instance): extract functions from server create command

[Codelax]

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Relates OR Closes #0000

Release note for CHANGELOG:

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 90.05236% with 19 lines in your changes missing coverage. Please review.

Project coverage is 69.28%. Comparing base (5bf53e0) to head (e09e2dd).
Report is 136 commits behind head on master.

Files	Patch %	Lines
...spaces/instance/v1/custom_server_create_builder.go	89.61%	11 Missing and 5 partials ⚠️
...nal/namespaces/instance/v1/custom_server_create.go	91.89%	2 Missing and 1 partial ⚠️

❗ There is a different number of reports uploaded between BASE (5bf53e0) and HEAD (e09e2dd). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (5bf53e0)	HEAD (e09e2dd)
	2	1

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3933      +/-   ##
==========================================
- Coverage   75.45%   69.28%   -6.17%     
==========================================
  Files         202      291      +89     
  Lines       44323    55178   +10855     
==========================================
+ Hits        33444    38231    +4787     
- Misses       9653    15375    +5722     
- Partials     1226     1572     +346     

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