Let pipeline-compiler export step types

[6543]

groundwork to address #269 (missing part are UI changes)

[codecov-commenter]

Codecov Report

Patch coverage: 51.40% and project coverage change: -0.20 ⚠️

Comparison is base (6c58e9d) 39.28% compared to head (11bf6c1) 39.08%.

❗ Current head 11bf6c1 differs from pull request most recent head 92a8986. Consider uploading reports for the commit 92a8986 to get more accurate results

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1958      +/-   ##
==========================================
- Coverage   39.28%   39.08%   -0.20%     
==========================================
  Files         177      178       +1     
  Lines       10734    10786      +52     
==========================================
- Hits         4217     4216       -1     
- Misses       6223     6274      +51     
- Partials      294      296       +2     

Impacted Files	Coverage Δ
pipeline/backend/docker/docker.go	0.00% <0.00%> (ø)
pipeline/backend/kubernetes/pod.go	0.00% <0.00%> (ø)
pipeline/frontend/yaml/compiler/convert.go	0.00% <0.00%> (ø)
pipeline/frontend/yaml/types/container.go	77.77% <0.00%> (ø)
server/model/pipeline.go	0.00% <ø> (ø)
server/model/step.go	0.00% <ø> (ø)
server/model/workflow.go	0.00% <ø> (ø)
...tastore/migration/020_parent_steps_to_workflows.go	59.45% <ø> (ø)
pipeline/frontend/yaml/compiler/compiler.go	6.93% <6.66%> (+0.11%)	⬆️
pipeline/stepBuilder.go	77.67% <67.85%> (+0.97%)	⬆️
... and 2 more

... and 2 files with indirect coverage changes

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