[Microsoft.AppConfiguration] Add specs for 2025-08-01-preview API version

[austintolani]

ARM (Control Plane) API Specification Update Pull Request

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[jiayi11]

LGTM

[microsoft-github-policy-service]

Hi, @@austintolani. Your PR has no update for 14 days and it is marked as stale PR. If no further update for over 14 days, the bot will close the PR. If you want to refresh the PR, please remove no-recent-activity label.

[austintolani]

⚠️Note to reviewers
This PR was approved by ARM months ago and was intentionally left inactive while we finalized/deployed the server side changes. I recently revisited this PR and added the following additional changes:

• Merging with main
• Minor changes to example files based on @sandipsh's comment
• Updating Snapshot.properties to be required from the 2025-08-01-preview API version. Our service requires this property, and our prior specs incorrectly did not mark it as required. Based on the guidance of azbreakchangereview@microsoft.com, we are marking it as required going forward.

I'm re-requesting ARM review to review the new changes and resolve @sandipsh's comments above.

[jiayi11]

LGTM