[@azure-rest/ai-vision-face] Update to v1.2-preview.1

[chungshengfu]

Packages impacted by this PR

@azure-rest/ai-vision-face

Issues associated with this PR

Describe the problem that is addressed by this PR

To support the latest Azure AI Face v1.2-preview.1 API.

What are the possible designs available to address the problem? If there are more than one possible design, why was the one in this PR chosen?

Are there test cases added in this PR? (If not, why?)

Provide a list of related PRs (if any)

Command used to generate this PR:**(Applicable only to SDK release request PRs)

Checklists

• [ ] Added impacted package name to the issue description
• [ ] Does this PR needs any fixes in the SDK Generator?** (If so, create an Issue in the Autorest/typescript repository and link it here)
• [ ] Added a changelog (if necessary)