enhance(deploy): validate on CreateDeployment

[ecrupper]

Give a response on an invalid deployment on creation rather than letting the webhook handler deal with it all the time.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 37 lines in your changes missing coverage. Please review.

Project coverage is 56.57%. Comparing base (f34ffb9) to head (99942e4).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
api/deployment/create.go	0.00%	20 Missing ⚠️
api/deployment/get_config.go	0.00%	16 Missing ⚠️
compiler/types/pipeline/deployment.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1236      +/-   ##
==========================================
- Coverage   56.60%   56.57%   -0.03%     
==========================================
  Files         628      628              
  Lines       35578    35596      +18     
==========================================
  Hits        20139    20139              
- Misses      14759    14777      +18     
  Partials      680      680              

Files with missing lines	Coverage Δ
compiler/types/pipeline/deployment.go	89.28% <0.00%> (ø)
api/deployment/get_config.go	0.00% <0.00%> (ø)
api/deployment/create.go	0.00% <0.00%> (ø)

[KellyMerrick]

lgtm