DnsServerDsc Integration tests: Wait for LCM Idle

[Sudman1]

Pull Request (PR) description

Modified integration tests to wait for the LCM before moving to the next test.

This Pull Request (PR) fixes the following issues

• Fixes #239

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.
• [X] Integration tests added/updated (where possible). See DSC Community Testing Guidelines.
• [X] New/changed code adheres to DSC Community Style Guidelines.

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This change is 

[codecov[bot]]

Codecov Report

Merging #240 (87e1098) into main (1c72be5) will not change coverage. The diff coverage is n/a.

@@         Coverage Diff         @@
##           main   #240   +/-   ##
===================================
  Coverage    90%    90%           
===================================
  Files        14     14           
  Lines      1484   1484           
===================================
  Hits       1348   1348           
  Misses      136    136