hurodata[48] Fix - storage account private endpoint is possible if it…

[nileshgadgi]

what

• Condition in the resource group name is added in existing resource group.
• Vnet link configured to create resource if the vnet is in the same resource group and existing dns zone name is passed.

why

• When user creating the private endpoint in the same vnet and subnet then module was creating a vnet link resource, now it will not create it if user will pass only the existing dns zone name and not existing resource group name.

references

• Link to any supporting jira issues or helpful documentation to add some context (e.g. stackoverflow).
• Use closes #123, if this PR closes a Jira issue #123