WIP: Improve test data

[kwk]

I'm working on this PR to change the test data layout.... will write more about it soon.

[codecov-io]

Codecov Report

Merging #2160 into master will increase coverage by 0.05%.
The diff coverage is 63.41%.

@@            Coverage Diff             @@
##           master    #2160      +/-   ##
==========================================
+ Coverage   69.35%   69.41%   +0.05%     
==========================================
  Files         170      166       -4     
  Lines       15995    15504     -491     
==========================================
- Hits        11094    10762     -332     
+ Misses       3855     3766      -89     
+ Partials     1046      976      -70

Impacted Files	Coverage Δ
workitem/field_definition.go	81.3% <100%> (+0.6%)	⬆️
workitem/list_type.go	88.57% <33.33%> (-11.43%)	⬇️
workitem/simple_type.go	79.43% <42.85%> (-1.44%)	⬇️
controller/workitemtype.go	66.17% <45.71%> (-9.28%)	⬇️
workitem/enum_type.go	85.36% <81.81%> (-8.26%)	⬇️
spacetemplate/importer/repository.go	78.92% <94.73%> (+7.27%)	⬆️
rendering/markdown.go	63.15% <0%> (-13.16%)	⬇️
workitem/link/type.go	92.45% <0%> (-7.55%)	⬇️
ptr/ptr.go	23.52% <0%> (-5.89%)	⬇️
... and 41 more

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[kwk]

[test]

This PR is not ready.