Changed default authentication provider to "Unauthenticated" in dab.draft.schema.json.

[anushakolan]

Why make this change?

Closes #3392.

The JSON schema default for runtime.host.authentication.provider was set to AppService, while CLI help text and docs indicate the default should be Unauthenticated. This mismatch can confuse users and tooling.

What is this change?

• Updated the schema default in schemas/dab.draft.schema.json:
  • runtime.host.authentication.provider: AppService -> Unauthenticated
• No runtime behavior changes were introduced beyond aligning the schema default value.

How was this tested?

• Integration Tests
• Unit Tests

Ran:

• dotnet test src/Service.Tests/Azure.DataApiBuilder.Service.Tests.csproj --framework net8.0 --filter "FullyQualifiedName~CorsUnitTests.TestCorsConfigReadCorrectly"

Sample Request(s)

CLI example:

• dab configure --runtime.host.authentication.provider AppService
• This demonstrates overriding the default.

Config example:

• Omit runtime.host.authentication.provider from config.
• Schema default resolves it to Unauthenticated.

[Copilot]

Pull request overview

Aligns the JSON schema’s default authentication provider with the documented/CLI-indicated default to avoid confusing users and tooling (closes #3392).

Changes:

• Updated runtime.host.authentication.provider schema default from AppService to Unauthenticated.