Refactor pipeline engine

[6543]

restructure pipeline/*.go to use submodules

• pipeline/error.go -> pipeline/errors/...
• pipeline/pipeline.go#Runtime -> pipeline/runtime/runtime.go
• pipeline/pipeline.go#execAll -> pipeline/runtime/executor.go
• pipeline/shutdown.go -> pipeline/runtime/shutdown.go
• pipeline/logger.go ->pipeline/logging
• pipeline/tracer.go -> pipeline/tracing
• pipeline/pipeline.go#State -> state/state.go

Originally posted by @6543 in #6039 (comment)

[anbraten]

Before starting those updates we should migrate the step-builder to not loose more control #3967

[6543]

Before starting those updates we should migrate the step-builder to not loose more control #3967

sure ... this refactoring will also help the step builder to move into the right places ...

@anbraten after #6056 was merged I will look into moving the bussines logic out of server/queue into server/scheduler ... and have a simple queue interface that supports locking

that way we can get the server more and more cluster ready without needing a master/slave selection etc

[codecov]

Codecov Report

❌ Patch coverage is 33.33333% with 62 lines in your changes missing coverage. Please review.
✅ Project coverage is 31.65%. Comparing base (2ca6f58) to head (b314df1).
⚠️ Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
pipeline/runtime/runtime.go	0.00%	16 Missing ⚠️
agent/runner.go	0.00%	11 Missing ⚠️
pipeline/runtime/executor.go	0.00%	9 Missing ⚠️
pipeline/errors/linter.go	75.00%	8 Missing ⚠️
cli/exec/exec.go	0.00%	7 Missing ⚠️
agent/tracer.go	0.00%	3 Missing ⚠️
pipeline/frontend/yaml/matrix/matrix.go	0.00%	2 Missing ⚠️
pipeline/runtime/option.go	0.00%	2 Missing ⚠️
pipeline/tracing/tracer.go	0.00%	2 Missing ⚠️
agent/logger.go	0.00%	1 Missing ⚠️
... and 1 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6073      +/-   ##
==========================================
- Coverage   31.66%   31.65%   -0.01%     
==========================================
  Files         420      421       +1     
  Lines       28413    28430      +17     
==========================================
+ Hits         8996     8999       +3     
- Misses      18596    18609      +13     
- Partials      821      822       +1     

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[6543]

I first created the new files with copiright headers and then moved single func/types over to it manually.

git after the fact marked some files as renamed and thats how copiright got marked as changed.

i now use the year of tje sourcefile where the func/type is comming from

[qwerty287]

lgtm, untested from me

[6543]

no real functunal change just moves code around ;)

[6543]

functional change will be in a followup