chore(instance): add EndOfService warning on server get, create and update

[Mia-Cross]

Closes #4691

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 46.51163% with 46 lines in your changes missing coverage. Please review.

Project coverage is 55.18%. Comparing base (5bf53e0) to head (7485fde).
Report is 639 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/namespaces/instance/v1/helpers_types.go	0.00%	35 Missing ⚠️
internal/namespaces/instance/v1/custom_server.go	75.75%	5 Missing and 3 partials ⚠️
...nal/namespaces/instance/v1/custom_server_create.go	83.33%	2 Missing and 1 partial ⚠️

❗ There is a different number of reports uploaded between BASE (5bf53e0) and HEAD (7485fde). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (5bf53e0)	HEAD (7485fde)
	2	1

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #4749       +/-   ##
===========================================
- Coverage   75.45%   55.18%   -20.27%     
===========================================
  Files         202      312      +110     
  Lines       44323    80091    +35768     
===========================================
+ Hits        33444    44199    +10755     
- Misses       9653    34480    +24827     
- Partials     1226     1412      +186     

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