[ARM] az deployment: Fix the problem that the templateLink will not be returned when deploying or validating template-uri (#13317)

[zhoxing-ms]

Issue: #13317 #12890 #12990

Description
This problem is caused by the simultaneous values of the template and template_link parameters in the DeploymentProperties when handling --handle-extended-json-format:
The service API returns templateLink only if the request parameter is templateLink.

When both template_link and template have values in DeploymentProperties, the Python SDK will take the data of template as the main data, and the request body for service API are:

{"properties": {"parameters": {}, "mode": "Incremental", template:{
    "$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json#",
    "contentVersion": "1.0.0.0",
    "resources": [],
    "outputs": {
        "deploymentOutput": {
            "value": "[deployment()]",
            "type" : "object"
        }
    }
}}}

Therefore, the service API does not return templateLink.

And When there is only templatelink in DeploymentProperties，the request body for service API are:

{"properties": {"templateLink": {"uri": "https://devtestzipacc.blob.core.windows.net/test/mainTemplate.json"}, "parameters": {}, "mode": "Incremental"}}

In this case, the service API will return templateLink

By the way, if the request parameter in DeploymentProperties is only templateLink, there is no need to change the configuration of the deployment_client that sent the parameter as JSON template, otherwise the service API will report an error.

Testing Guide
When deploying or validating the ARM template, please use the --template-uri parameter to see if tempalteLink will be returned.

History Notes

[Component Name 1] BREAKING CHANGE: az command a: Make some customer-facing breaking change.
[Component Name 2] az command b: Add some customer-facing feature.

---

This checklist is used to make sure that common guidelines for a pull request are followed.

• The PR title and description has followed the guideline in Submitting Pull Requests.

• I adhere to the Command Guidelines.

[qianwens]

[yonzhan]

add to S169