Remove unnecessary Import-Module in SharePoint Subscription to fix error in 23H1

[Yvand]

Pull Request (PR) description

Starting with SharePoint Subscription 21H1, running Import-Module SharePointServer -Verbose:$false causes an exception.
This PR removes this import if it detects SharePoint Subscription as it is unnecessary (even in SharePoint Subscription RTM)

This Pull Request (PR) fixes the following issues

• Fixes #123

Task list

• [x] 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).
• [ ] 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 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 

[ykuijs]

Hi @Yvand, thanks for testing and submitting this PR. Unfortunately, the unit tests are failing because you have fully removed the $basescript variable, which is being used later in the script. Could you update this to $basescript = '' instead of deleting the entire else-block? And also please add an item to the changelog.....the quality checks are failing because of that ;-)

[codecov[bot]]

Codecov Report

Merging #1425 (19504ad) into master (8dba53d) will not change coverage. The diff coverage is 100%.

@@          Coverage Diff           @@
##           master   #1425   +/-   ##
======================================
  Coverage      84%     84%           
======================================
  Files         145     145           
  Lines       22647   22647           
======================================
  Hits        19076   19076           
  Misses       3571    3571           

Impacted Files	Coverage Δ
...Modules/SharePointDsc.Util/SharePointDsc.Util.psm1	51% <100%> (ø)