Added support of BuiltSubDirectoryDirectory in build configuration files (#299)

[NicolasBn]

Pull Request

Pull Request (PR) description

Added

• Added support of BuiltSubDirectoryDirectory in build configuration files (#299)

Task list

• [x] The PR represents a single logical change. i.e. Cosmetic updates should go in different PRs.
• [x] Added an entry under the Unreleased section of in the CHANGELOG.md as per format.
• [x] Local clean build passes without issue or fail tests (build.ps1 -ResolveDependency).
• [ ] Resource documentation added/updated in README.md.
• [ ] Resource parameter descriptions added/updated in README.md, schema.mof and comment-based help.
• [ ] Comment-based help added/updated.
• [ ] Localization strings added/updated in all localization files as appropriate.
• [ ] Examples appropriately added/updated.
• [ ] Unit tests added/updated. See DSC Resource Testing Guidelines.
• [ ] Integration tests added/updated (where possible). See DSC Resource Testing Guidelines.
• [ ] New/changed code adheres to DSC Resource Style Guidelines and Best Practices.

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This change is 

[codecov[bot]]

Codecov Report

Merging #306 (594da9b) into main (743ab9e) will increase coverage by 0%. The diff coverage is 50%.

@@         Coverage Diff         @@
##           main   #306   +/-   ##
===================================
  Coverage    28%    28%           
===================================
  Files        38     38           
  Lines      1925   1930    +5     
===================================
+ Hits        555    557    +2     
- Misses     1370   1373    +3     

Impacted Files	Coverage Δ
Sampler/scripts/Set-SamplerTaskVariable.ps1	92% <50%> (-6%)	:arrow_down:

[gaelcolas]

That looks good, assuming it works :).