Add support for SignalR emulator

[cqnguy23]

Description

• This PR adds support for SignalR Emulator https://learn.microsoft.com/en-us/azure/azure-signalr/signalr-howto-emulator

Fixes # (issue)

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
    • Is this introducing a breaking change?
      • Yes
        • Link to aspire-docs issue (please use this breaking-change template):
      • No
        • Link to aspire-docs issue (please use this doc-idea template):
  • No

Microsoft Reviewers: Open in CodeFlow

Addresses issue #6676

[vicancy]

this is a little bit heavy dependency, is it possible to not dependent on it?

[cqnguy23]

I think the convention for other services is to use the Service SDK to init a client for healthcheck. In my opinion, it looks more clean that way as well. Also the tests use this SDK to get negotiate URL as well

[vicancy]

Microsoft.Azure.SignalR.Management is a little bit different story, and it references Microsoft.Azure.SignalR which references aspnetcore SignalR. It sounds too much for a project doing the service provisioning

[vicancy]

does a simple http call work?

[vicancy]

could we update the emulator to not dependent on "AccessKey" so that we don't need to have the AccessKey in code although it is fake

[vicancy]

Revert the comment. Emulator could be working in an isolated environment, so Microsoft Entra ID should not be a dependency when using Emulator. AccessKey is a best choice for existing SDKs to work seamlessly.

[BrennanConroy]

Why do you need the signalr client reference? Looks like it's only used in a test, so shouldn't the reference be on the test project?

[cqnguy23]

you're right, let me move it to test project

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