Allow configurable test settings

[diecknet]

📑 Description

Previously Get-MtMaesterConfig only imported the severity from the test specific settings from maester-config.json.

maester/powershell/internal/Get-MtMaesterConfig.ps1

Lines 153 to 154 in dc49768

	# Update the existing properties (right now only Severity is supported)
	$mainTestSetting.Severity = $customSetting.Severity

With this PR the cmdlet imports all values for a test from the JSON config file.

Closes #1798

✅ Checks

• My pull request adheres to the code style of this project.
• My code requires changes to the documentation.
• I have updated the documentation as required.
• The build and unit tests pass after running /powershell/tests/pester.ps1 locally.

ℹ️ Additional Information

---

[codacy-production]

Up to standards ✅

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