[FEATURE REQ] Update quick-start doc of Spring Data JPA with SQL Database to include credential-free connection

[saragluna]

Context

The driver of SQL Database has already supported Azure AD authentication, we should update our quickstart doc of Spring quickstart SQL Database JPA to include the credential-free connection method. Since this driver doesn't support DefautAzureCredential, we can only mention how to use Managed Identity and service principals.

There's a template worked out by Alex can be found here:

• https://github.com/MicrosoftDocs/azure-docs-pr/pull/203348#issuecomment-1205727432
• https://github.com/MicrosoftDocs/azure-docs-pr/pull/203348#issuecomment-1203381358

We should demo two connection methods in this doc, one using credential-free connections and one using username/password, using contextual tabs to distinguish them. We should make the credential-free tab as the default/recommended.

Goal

Update the quick-start doc to include the credential-free part.