Fixes empty parameters for amba service hook and email contact

[arjenhuitema]

Overview/Summary

This pull request addresses an issue with the Portal Accelerator related to the Azure Monitor Baseline Alerts notification settings. The problem occurred when neither an email address nor a service hook was specified on the Baseline alerts and monitoring tab. In such cases, an empty string was being converted to an array in the format [""] rather than []. This led to errors during the remediation of the Notification Assets initiative.

This PR fixes/adds/changes/removes

1. Sets ALZWebhookServiceUri to null if ambaAgServiceHook is empty; otherwise, it uses the value of ambaAgServiceHook.
2. Sets ALZMonitorActionGroupEmail to null if ambaAgEmailContact is empty; otherwise, it uses the value of ambaAgEmailContact.

Breaking Changes

None

Testing Evidence

An empty string is now properly converted to an empty array during deployment.

Remediation:

When a value is defined.

Testing URLs

The below URLs can be updated where the placeholders are, look for {YOUR GITHUB BRANCH NAME HERE - Remove Curly Brackets Also} & {YOUR GITHUB BRANCH NAME HERE - Remove Curly Brackets Also}, to allow you to test your portal deployment experience.

Please also replace the curly brackets on the placeholders {}

Azure Public

As part of this Pull Request I have

• Checked for duplicate Pull Requests
• Associated it with relevant issues, for tracking and closure.
• Ensured my code/branch is up-to-date with the latest changes in the main branch
• Performed testing and provided evidence.
• Ensured contribution guidance is followed.
• Updated relevant and associated documentation.
• Updated the "What's New?" wiki page (located: /docs/wiki/whats-new.md)

[Springstone]

LGTM