Fix ad domain controller

[jkattmann]

Pull Request (PR) description

Created Get-DomainObject in ActiveDirectoryDsc.Common to wrap Get-ADDomain calls with common retry logic and refactor ADDomainController & ADDomain to utilize it.

This Pull Request (PR) fixes the following issues

• Fixes #673

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).
• [X] Resource documentation added/updated in README.md.
• [X] Resource parameter descriptions added/updated in README.md, schema.mof and comment-based help.
• [X] Comment-based help added/updated.
• [X] Localization strings added/updated in all localization files as appropriate.
• [X] Examples appropriately added/updated.
• [X] 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 #686 (94e0b5a) into main (b8c9012) will decrease coverage by 0%. The diff coverage is 96%.

@@         Coverage Diff         @@
##           main   #686   +/-   ##
===================================
- Coverage    98%    97%   -1%     
===================================
  Files        25     25           
  Lines      3420   3433   +13     
===================================
+ Hits       3352   3364   +12     
- Misses       68     69    +1     

Impacted Files	Coverage Δ
...DirectoryDsc.Common/ActiveDirectoryDsc.Common.psm1	95% <96%> (+<1%)	:arrow_up:
...urce/DSCResources/MSFT_ADDomain/MSFT_ADDomain.psm1	100% <100%> (ø)
...FT_ADDomainController/MSFT_ADDomainController.psm1	100% <100%> (ø)