[Bug Report]: RSV module validation fails when deployed with identity

### Describe the bug

RSV deployment validation fails when system and user assigned identity parameters are added as input parameters.
Failure started with this pipeline run https://github.com/Azure/ResourceModules/actions/runs/3530599233 and consistent ever since.
Reproduced by adding identity parameters to the min test. The test failed the second time it was deployed, with the log output as below.
Identity has been removed from common module validation test by PR #2388, but kept in the module, since the failure does not appear to be related to a wrong implementation.
This issue is about further investigating on the bug and monitor overtime if the issue is temporary.

### To reproduce

Add system and user assigned identity to any RSV test. Redeploy twice.

### Code snippet

```Bicep
systemAssignedIdentity: true
userAssignedIdentities: {
'${resourceGroupResources.outputs.managedIdentityResourceId}': {}
}
```

### Relevant log output

```Shell
Status Message: Identity operation for resource '/subscriptions/***/resourceGroups/ms.recoveryservices.vaults-rsvcom-rg/providers/Microsoft.RecoveryServices/vaults/***rsvcom001' failed with error 'Failed to perform resource identity operation. Status: 'Conflict'. Response: '{"error":{"code":"Conflict","message":"Request specified that resource '/subscriptions/***/resourcegroups/ms.recoveryservices.vaults-rsvcom-rg/providers/Microsoft.RecoveryServices/vaults/***rsvcom001' is new, but resource already exists. This may be due to a pending delete operation, try again later."}}'.'. (Code:FailedIdentityOperation)
```