SqlServerDsc: Fix codecov

[johlju]

Pull Request (PR) description

• SqlServerDsc
  • Update codecov.yml to support carry forward flags.

This is in preparation for adding a future request to Codecov.io.

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.

---

This change is 

[codecov]

Codecov Report

Merging #1706 (c626b26) into main (48ecbd9) will not change coverage.
The diff coverage is n/a.

@@         Coverage Diff          @@
##           main   #1706   +/-   ##
====================================
  Coverage    97%     97%           
====================================
  Files        38      38           
  Lines      6325    6325           
====================================
  Hits       6169    6169           
  Misses      156     156           

Flag	Coverage Δ
unit	97% <ø> (ø)