SqlSetup: SourcePath should be a mandatory parameter

[jrdbarnes]

Pull Request (PR) description

SourcePath should be a mandatory parameter on the *-TargetResource
functions, as an exception is thrown if the parameter is not passed.

This Pull Request (PR) fixes the following issues

• Fixes SqlSetup: SourcePath should be a mandatory parameter #1755

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 #1756 (3e2daef) into main (d6eebb5) will not change coverage.
The diff coverage is n/a.

@@         Coverage Diff          @@
##           main   #1756   +/-   ##
====================================
  Coverage    87%     87%           
====================================
  Files        38      38           
  Lines      6348    6348           
====================================
  Hits       5574    5574           
  Misses      774     774           

Flag	Coverage Δ
unit	87% <ø> (ø)

Impacted Files	Coverage Δ
source/DSCResources/DSC_SqlSetup/DSC_SqlSetup.psm1	98% <ø> (ø)

[johlju]

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