fix(compiler): split validate into YAML and Pipeline

[ecrupper]

There are a couple things that are checked during Validate that may not accurately reflect the build that ends up being run. For instance, you could name steps the same if it's guaranteed they will never run at the same time due to rulesets. By splitting validate into a YAML validation and a pipeline validation, we have a more accurate validator.

I am also moving InitStep and CloneStep to after the validation call. This is inconsequential ordering since those two functions force their respective steps to the front of the line regardless of when they are invoked.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.60%. Comparing base (3da62c5) to head (b94cd17).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1268      +/-   ##
==========================================
+ Coverage   56.55%   56.60%   +0.05%     
==========================================
  Files         630      630              
  Lines       35710    35745      +35     
==========================================
+ Hits        20195    20233      +38     
+ Misses      14828    14826       -2     
+ Partials      687      686       -1     

Files with missing lines	Coverage Δ
compiler/native/compile.go	70.83% <100.00%> (+0.52%)	⬆️
compiler/native/validate.go	100.00% <100.00%> (+3.06%)	⬆️

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