ADE pre-requisite script to pass AAD client secret as a secure string

[SudhakaraReddyEvuri-zz]

Description

Update ADE pre-requisite script to pass AAD client secret as a secure string. This is because of a breaking change in New-AzureRmAdApplication cmdlet, plain string is not accepted as client secret anymore.

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[rond6251]

I have been able to test this updated syntax and it works well.

[markcowl]

tests? Please ensure this is tested end-to-end, and either add covering test automation as part of thisPR, or add a test debt issue in the repo to add test automation for the January release and link the issue here.

[SudhakaraReddyEvuri-zz]

Hey Mark, this is a sample / example usage script, which was manually validated to be working fine. I sign off based on the manual vaidation

[markcowl]

OK, can we add some validation so that we know when this script fails in the future, or would that be ifficult

[SudhakaraReddyEvuri-zz]

Opened issue #5081 to track this