Add an Azure Portal Form UI

[glennmusa]

Description

Adds a stepped wizard Azure Portal form with input validation and adds the Deploy to Azure buttons to the relevant READMEs.

To demo this (these buttons launch the Custom Portal Blade experience from this branch, /glenn/formUi, the READMEs in this branch are linked to their eventual destination, /main after these changes are merged):

This change introduces a form that:

• uses ArmApiControls to query for the user's subscriptions
• uses ArmApiControls to query for a list of locations available to the user and trim the list to a specific subset we control
• uses regex validation to ensure the virtual network and subnet address pairs are valid
• allows for opt-in of Azure Policy and policy set selection
• allows for opt-in of Azure Security Center and validation of security contact e-mail address
• allows for opt-in of Azure Sentinel
• allows for opt-in of Azure Bastion Host and validation of virtual machine usernames and credentials
• captures user provided custom tags

Issue reference

The issue this PR will close: #482

Checklist

Please make sure you've completed the relevant tasks for this PR out of the following list:

• All acceptance criteria in the backlog item are met
• The documentation is updated to cover any new or changed features
• Manual tests have passed
• Relevant issues are linked to this PR

[brooke-hamilton]

Putting custom buttons in the PR description was clever because it was not possible to test the buttons from the branch due to the branch path in the template URI. 🥲

[glennmusa]

Putting custom buttons in the PR description was clever because it was not possible to test the buttons from the branch due to the branch path in the template URI. 🥲

It's a tricky dance!