DnsServerDsc: Replace ConvertTo-HashTableFromObject

[johlju]

Pull Request (PR) description

• Replaced the private function ConvertTo-HashTableFromObject with the public function ConvertFrom-DscResourceInstance (from DscResource.Common).

This Pull Request (PR) fixes the following issues

None.

Task list

• [x] 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 added/updated in README.md.
• [ ] Resource parameter descriptions added/updated in README.md, schema.mof and comment-based help.
• [ ] Comment-based help added/updated.
• [ ] Localization strings added/updated in all localization files as appropriate.
• [ ] Examples appropriately added/updated.
• [ ] Unit tests added/updated. See DSC Community Testing Guidelines.
• [ ] Integration tests added/updated (where possible). See DSC Community Testing Guidelines.
• [x] New/changed code adheres to DSC Community Style Guidelines.

---

This change is 

[johlju]

Waiting for the command to be available in a full release.

[codecov[bot]]

Codecov Report

Merging #263 (d596072) into main (666fca0) will decrease coverage by 0%. The diff coverage is 100%.

@@         Coverage Diff         @@
##           main   #263   +/-   ##
===================================
- Coverage    91%    91%   -1%     
===================================
  Files        40     39    -1     
  Lines      1718   1714    -4     
===================================
- Hits       1575   1571    -4     
  Misses      143    143           

Impacted Files	Coverage Δ
source/Classes/001.ResourceBase.ps1	98% <100%> (ø)
source/Classes/002.DnsRecordBase.ps1	97% <100%> (ø)