Add support for BeIn

[johlju]

Pull Request (PR) description

• Add support for Should operators:
  • BeIn

This Pull Request (PR) fixes the following issues

• Fixes Support convert Should -BeIn to v6 syntax #9

Task list

• Added an entry to the change log under the Unreleased section of the
  file CHANGELOG.md. Entry should say what was changed and how that
  affects users (if applicable), and reference the issue being resolved
  (if applicable).
• Documentation added/updated in README.md and source/WikiSource.
• Comment-based help added/updated for all new/changed functions.
• Localization strings added/updated in all localization files as appropriate.
• Examples appropriately added/updated.
• Unit tests added/updated. See DSC Community Testing Guidelines.
• Integration tests added/updated (where applicable). See
  DSC Community Testing Guidelines.
• New/changed code adheres to DSC Community Style Guidelines.

---

This change is 

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99%. Comparing base (8cba13b) to head (271c6d1).
Report is 3 commits behind head on main.

Additional details and impacted files

@@         Coverage Diff         @@
##           main    #26   +/-   ##
===================================
  Coverage    99%    99%           
===================================
  Files        26     28    +2     
  Lines      1015   1088   +73     
===================================
+ Hits       1012   1085   +73     
  Misses        3      3           

Flag	Coverage Δ
unit	99% <100%> (+<1%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
source/Private/Convert-ShouldBeIn.ps1	100% <100%> (ø)
source/Private/Convert-ShouldNotThrow.ps1	100% <100%> (ø)
source/Private/Get-PesterCommandParameter.ps1	100% <100%> (ø)
source/Private/Get-PipelineBeforeShould.ps1	100% <ø> (ø)
source/Private/Test-IsPipelinePart.ps1	100% <100%> (ø)
source/Public/Convert-PesterSyntax.ps1	96% <100%> (+<1%)	⬆️

[johlju]

Reviewed 15 of 15 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @johlju)