Move version checks from public container to static website

[vibhansa-msft]

✅ What

Version check is done on a public container with anonymous access, but due to security issues the public access will be terminated soon. Now onwards the version check with work through a static website hosted on same storage account,

🤔 Why

Security vulnerability restricting anonymous access.

👩‍🔬 How to validate if applicable

Check the URI used to retrieve the latest version

🔖 Related links

NA

[vibhansa-msft]

Current changeset is getting an index.xml file from the website and expects it will have latest version written under \<latest> tag in that xml file.