Disable local auth on Azure SignalR

[vicancy]

Description

Fixes #9798

Checklist

• Is this feature complete?
  • Yes. Ready to ship.
  • No. Follow-up changes expected.
• Are you including unit tests for the changes and scenario tests if relevant?
  • Yes
  • No
• Did you add public API?
  • Yes
    • If yes, did you have an API Review for it?
      • Yes
      • No
    • Did you add <remarks /> and <code /> elements on your triple slash comments?
      • Yes
      • No
  • No
• Does the change make any security assumptions or guarantees?
  • Yes
    • If yes, have you done a threat model and had a security review?
      • Yes
      • No
  • No
• Does the change require an update in our Aspire docs?
  • Yes
    • Link to aspire-docs issue (consider using one of the following templates):
      • New (or update) doc-idea template
      • New breaking-change template
      • New diagnostic template
  • No

[Copilot]

Pull Request Overview

This PR enables disabling local authentication on Azure SignalR resources to address issue #9798.

• Exposes a new DisableLocalAuth flag in the AzureSignalR resource builder.
• Updates SignalR Bicep modules to set disableLocalAuth: true.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/Aspire.Hosting.Azure.SignalR/AzureSignalRExtensions.cs	Adds DisableLocalAuth = true property to the resource
playground/signalr/SignalR.AppHost/signalrServerless.module.bicep	Sets disableLocalAuth: true in serverless module
playground/signalr/SignalR.AppHost/signalrDefault.module.bicep	Sets disableLocalAuth: true in default module

Comments suppressed due to low confidence (3)

src/Aspire.Hosting.Azure.SignalR/AzureSignalRExtensions.cs:87

• No unit tests cover the new DisableLocalAuth flag; add tests to verify it is correctly applied and serialized by the resource builder.

DisableLocalAuth = true,

playground/signalr/SignalR.AppHost/signalrServerless.module.bicep:13

• Add integration or scenario tests for the Bicep module to validate that disableLocalAuth is set as expected in the generated deployment template.

disableLocalAuth: true

playground/signalr/SignalR.AppHost/signalrDefault.module.bicep:13

• Add integration or scenario tests for the Bicep module to validate that disableLocalAuth is set as expected in the generated deployment template.

disableLocalAuth: true