refactor(steps/services): use server API types for steps and services

[ecrupper]

Also added missing constants. All that remain after this is log, build_executable, and a few other stray types from outside the library and database packages.

[codecov]

Codecov Report

Attention: Patch coverage is 93.79699% with 66 lines in your changes missing coverage. Please review.

Project coverage is 56.35%. Comparing base (37f2c35) to head (afd5d78).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
api/types/service.go	87.10%	30 Missing and 15 partials ⚠️
api/build/graph.go	0.00%	5 Missing ⚠️
api/step/plan.go	0.00%	4 Missing ⚠️
api/service/plan.go	0.00%	3 Missing ⚠️
api/build/update.go	0.00%	2 Missing ⚠️
api/admin/service.go	0.00%	1 Missing ⚠️
api/admin/step.go	0.00%	1 Missing ⚠️
api/build/clean.go	0.00%	1 Missing ⚠️
api/service/create.go	0.00%	1 Missing ⚠️
api/service/update.go	0.00%	1 Missing ⚠️
... and 2 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1210      +/-   ##
==========================================
+ Coverage   55.17%   56.35%   +1.17%     
==========================================
  Files         586      590       +4     
  Lines       31488    32438     +950     
==========================================
+ Hits        17374    18279     +905     
- Misses      13500    13530      +30     
- Partials      614      629      +15     

Files with missing lines	Coverage Δ
api/admin/clean.go	0.00% <ø> (ø)
api/admin/worker.go	0.00% <ø> (ø)
api/auth/logout.go	0.00% <ø> (ø)
api/auth/post_token.go	0.00% <ø> (ø)
api/badge.go	0.00% <ø> (ø)
api/build/approve.go	0.00% <ø> (ø)
api/build/auto_cancel.go	16.48% <ø> (ø)
api/build/cancel.go	0.00% <ø> (ø)
api/build/compile_publish.go	0.00% <ø> (ø)
api/build/list_org.go	0.00% <ø> (ø)
... and 203 more

... and 1 file with indirect coverage changes

[KellyMerrick]

lgtm