defaulting pipelines to build in a submodule of BuildModuleOutput

[gaelcolas]

Fixing default built submodule to be within a module subdir of output by default.

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This change is 

[gaelcolas]

It's also a draft as I'm working on some other stuff and I need a PR for testing :)

[codecov[bot]]

Codecov Report

Merging #379 (73dbf3d) into main (1430b37) will decrease coverage by 23%. The diff coverage is n/a.

@@         Coverage Diff          @@
##           main   #379    +/-   ##
====================================
- Coverage    27%     4%   -24%     
====================================
  Files        40     12    -28     
  Lines      2212   1474   -738     
====================================
- Hits        615     60   -555     
+ Misses     1597   1414   -183     

Impacted Files	Coverage Δ
...ampler/Public/Convert-SamplerHashtableToString.ps1
Sampler/Public/Get-PesterOutputFileFileName.ps1
Sampler/Public/Get-MofSchemaName.ps1
Sampler/Public/Get-OperatingSystemShortName.ps1
Sampler/Public/Get-BuiltModuleVersion.ps1
Sampler/Public/Get-SamplerBuiltModuleManifest.ps1
...mpler/Public/Get-SamplerCodeCoverageOutputFile.ps1
Sampler/Public/Split-ModuleVersion.ps1
Sampler/Public/Merge-JaCoCoReport.ps1
Sampler/Public/New-SampleModule.ps1
... and 18 more

[gaelcolas]

Making this change in another PR.