ADManagedServiceAccount: add ServicePrincipalNames setting

[rismoney]

• This is a string array and specifies Service Principal Names for an AD Managed Service Account

Pull Request (PR) description

This Pull Request (PR) fixes the following issues

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 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.
• New/changed code adheres to DSC Community Style Guidelines.

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This change is 

[rismoney]

@johlju I am not sure I am doing mocks properly here.

Should call the correct mocks when ServicePrincipalNames has changed 55ms
2024-09-03T14:58:46.6342266Z           Exception: System.InvalidOperationException: Error setting Group Account 'TestGMSA'. (MSA0014) ---> System.Management.Automation.ParameterBindingException: Cannot convert 'System.String[]' to the type 'System.Collections.Hashtable' required by parameter 'ServicePrincipalNames'. Specified method is not supported. ---> System.NotSupportedException: Specified method is not supported.

I have been playing around with the datatypes a bit, and not sure how to properly handle this.
I believe the AD attribute specified by the cmdlets is in this notation 'a','b','c' which I believe is treated as an System.String[] which I believe to be an array of strings/System array. In the tests I was unsure if it should be $null, or @(). Also not totally what is up here. I haven't messed with pester in a long time so not sure if I have issue with code, or tests.

[rismoney]

ugh I see now- set-adservice account uses serviceprincipals account as a hashtable. ok. love the MS consistency.

ref - https://learn.microsoft.com/en-us/powershell/module/activedirectory/set-adserviceaccount?view=windowsserver2022-ps