[Modules] Configure privateDnsZoneGroups on Web PubSub Service

[eriqua]

Description

Closes #1695

• Adding private DNS zone group id to associate the private endpoint with a private DNS zone.
• Updating publicNetworkAccess implementation to be disabled by default only if:
  • no explicit value is passed
  • private endpoint parameter is not empty
  • network acls parameter is empty
    This is needed to allow both private endpoint and firewall rules to be applied on the same resource (i.e. set network access to selected networks only)
• Updating main test to deploy both pe and network acls (to test that public network access stays enabled).
• Adding pe test to deploy pe alone (to test that public network access gets disabled).
• Updating parameter description and deployment name typos

Pipeline references

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Pipeline

Type of Change

Please delete options that are not relevant.

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Update to documentation

Checklist

• I'm sure there are no other open Pull Requests for the same update/change
• My corresponding pipelines / checks run clean and green without any errors or warnings
• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (readme)
• I did format my code