feat: add an optional audit resource group

[MatthewLemmond]

Description

Create (or use an existing) resource group for audit resources created by the DA, added variable to test creation/use of the new resource group for audit resources

resolves #50

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Release notes content

Add an optional resource group for use with audit resources by providing a value for the var.audit_resource_group_name and also the option to use an existing audit resource group by setting var.use_existing_audit_resource_group to true

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[MatthewLemmond]

/run pipeline

[MatthewLemmond]

/run pipeline

[MatthewLemmond]

/run pipeline

[maheshwarishikha]

Updates are added in #8717 , need to update the code accordingly.