SqlDatabasePermission: Fix Credential property

[johlju]

Pull Request (PR) description

• SqlDatabasePermission
  • Now correctly return the username in the property Credential.

This Pull Request (PR) fixes the following issues

• Fixes SqlDatabasePermission: Return the correct username from Get-method for the Credential property  #1983

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 #1984 (9d65897) into main (e9639fd) will decrease coverage by 2%.
Report is 1 commits behind head on main.
The diff coverage is n/a.

Additional details and impacted files

@@          Coverage Diff           @@
##           main   #1984     +/-   ##
======================================
- Coverage    92%     90%     -2%     
======================================
  Files        93      36     -57     
  Lines      7840    6312   -1528     
======================================
- Hits       7214    5718   -1496     
+ Misses      626     594     -32     

Flag	Coverage Δ
unit	90% <ø> (-2%)	⬇️

see 57 files with indirect coverage changes

[johlju]

This won't work as the resource property Credential is not of the type CIM instance. So this is not the solution. Closing this.