DASD-12493 - Added content purge script for afd

[calumrees99]

Working deployment: https://sfa-gov-uk.visualstudio.com/Digital%20Apprenticeship%20Service/_releaseProgress?_a=release-environment-logs&releaseId=114199&environmentId=527610

[github-actions]

Test Results

2 710 tests  +81   2 710 ✅ +81   1m 9s ⏱️ -1s
  214 suites + 6       0 💤 ± 0 
    1 files   ± 0       0 ❌ ± 0 

Results for commit 0cfaca1. ± Comparison against base commit 24bc3d8.

This pull request removes 1 and adds 82 tests. Note that renamed tests count towards both.

Invoke-CdnContentPurge Unit Tests.Resource Group or CDN Profile does not exist.The specified Resource Group or CDN Profile was not found in the subscription, throw an error

Invoke-AfdContentPurge Unit Tests.Parameters are ok.Should call Clear-AzFrontDoorCdnEndpointContent
Invoke-AfdContentPurge Unit Tests.Purge Content Parameter Blank.Should throw an exception to warn that no content purge will be run
Invoke-AfdContentPurge Unit Tests.Resource Group or CDN Profile does not exist.Should throw an expection to warn that the the specified Resource Group or CDN Profile was not found in the subscription
Invoke-CdnContentPurge Unit Tests.Resource Group or CDN Profile does not exist.Should throw an expection to warn that the the specified Resource Group or CDN Profile was not found in the subscription
Script code quality tests.Invoke-AfdContentPurge.Should pass Script Analyzer rule PSAlignAssignmentStatement
Script code quality tests.Invoke-AfdContentPurge.Should pass Script Analyzer rule PSAvoidAssignmentToAutomaticVariable
Script code quality tests.Invoke-AfdContentPurge.Should pass Script Analyzer rule PSAvoidDefaultValueForMandatoryParameter
Script code quality tests.Invoke-AfdContentPurge.Should pass Script Analyzer rule PSAvoidDefaultValueSwitchParameter
Script code quality tests.Invoke-AfdContentPurge.Should pass Script Analyzer rule PSAvoidExclaimOperator
Script code quality tests.Invoke-AfdContentPurge.Should pass Script Analyzer rule PSAvoidGlobalAliases
…

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