Don't enable/disable admin settings if group policy prevents it

[AmelBawa-msft]

What was done?

• If an admin setting was disabled by a group policy, and user attempts to enable it using winget settings --enable, then report an error message.
• Similarly, if an admin setting was enabled by group policy, and user attempts to disable it using winget settings --disable, then report an error message.

Test?

• Added tests covering the various state combinations.

Microsoft Reviewers: Open in CodeFlow

[AmelBawa-msft]

/azp run

[azure-pipelines[bot]]

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