[ARM] az ts : Add UiFormDefinition file support to TemplateSpecs

[TSunny007]

Description

This PR bumps up the API version of TemplateSpecs and adds support for supplying an (optional) uiDefiniton file to az ts [create | update] operations.

Testing Guide

az ts

Create:

az ts create -g testRG --name TemplateSpecName -v 2.0 -l WestUS --template-file
        templateSpec.json --version-description "Less simple template spec" --ui-definition-file
        templateSpecUiDefinition.json

Update:

az ts update -g ExistingRG --name ExistingName -v 3.0 -f updatedTemplate.json --display-name
        "New parent display name" --description "New parent description" --version-description "New
        child description" --ui-defintion-file updatedUiDefinition.json

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.

• I adhere to the Error Handling Guidelines.

[yonzhan]

ARM

[zhoxing-ms]

@TarunSunkaraneni @detienne20 May I ask is this PR replaced by #17869? If so, could you please close this PR~

[zhoxing-ms]

As there was no reply for a long time, I closed it first. If you need it later, we can reopen it~