Improve `Merge-JaCoCoReport`

[johlju]

Pull Request

Pull Request (PR) description

Changed

• Merge-JaCoCoReport
  • Improvements to be able to merge missing elements, like entire element <class>, <sourcefile>, <method>

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).
• [ ] Documentation added/updated in README.md.
• [ ] Comment-based help added/updated.
• [ ] Localization strings added/updated in all localization files as appropriate.
• [x] Unit tests added/updated. See DSC Community Testing Guidelines.
• [ ] Integration tests added/updated (where possible). See DSC Community Testing Guidelines.
• [x] New/changed code adheres to DSC Community Style Guidelines.

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This change is 

[codecov[bot]]

Codecov Report

Merging #386 (c60d7c6) into main (02cc8da) will increase coverage by 0%. The diff coverage is 100%.

@@         Coverage Diff         @@
##           main   #386   +/-   ##
===================================
  Coverage    80%    81%           
===================================
  Files        41     41           
  Lines      2201   2224   +23     
===================================
+ Hits       1772   1807   +35     
+ Misses      429    417   -12     

Impacted Files	Coverage Δ
Sampler/Public/Merge-JaCoCoReport.ps1	100% <100%> (+41%)	:arrow_up: