SqlSetup: Add parameter SqlVersion

[johlju]

Pull Request (PR) description

• SqlSetup
  • Added the parameter SqlVersion that can be used to set the SQL Server
    version to be installed instead of it looking for version in the setup
    executable of the SQL Server media. This parameter is not allowed for
    the setup action Upgrade, if specified it will throw an exception
    (issue #1946).

This Pull Request (PR) fixes the following issues

• Fixes SqlSetup: Seems to evaluate the SourcePath too early for Puppet #1946

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).
• Resource documentation updated in the resource's README.md.
• Resource parameter descriptions updated in schema.mof.
• Comment-based help updated, including parameter descriptions.
• Localization strings updated.
• Examples updated.
• Unit tests updated. See DSC Community Testing Guidelines.
• Integration tests updated (where possible). See DSC Community Testing Guidelines.
• Code changes adheres to DSC Community Style Guidelines.

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This change is 

[codecov]

Codecov Report

Merging #1962 (3de67aa) into main (8047f7c) will increase coverage by 0%.
The diff coverage is 100%.

@@         Coverage Diff          @@
##           main   #1962   +/-   ##
====================================
  Coverage    91%     92%           
====================================
  Files        92      92           
  Lines      7810    7829   +19     
====================================
+ Hits       7185    7204   +19     
  Misses      625     625           

Flag	Coverage Δ
unit	92% <100%> (+<1%)	⬆️

Files Changed	Coverage Δ
source/DSCResources/DSC_SqlSetup/DSC_SqlSetup.psm1	98% <100%> (+<1%)	⬆️

[johlju]

Reviewed 3 of 5 files at r1, 3 of 3 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @johlju)