Add integration tests for SqlDatabase with PsDscRunAsCredential support

[johlju]

Pull Request (PR) description

• SqlServerDsc
  • Added integration tests for SqlDatabase that exercise PsDscRunAsCredential
    and dsc config usage with a separate parameters file for secure credentials.

This Pull Request (PR) fixes the following issues

None.

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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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94%. Comparing base (e971dc1) to head (6fd7f40).

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #2434   +/-   ##
=====================================
  Coverage     94%     94%           
=====================================
  Files        225     225           
  Lines      10761   10761           
=====================================
  Hits       10141   10141           
  Misses       620     620           

Flag	Coverage Δ
unit	94% <ø> (ø)

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[johlju]

This is still not supported by DSCv3. Closing for now, reopen when DSCv3 evolved to support it.