[SignalR extensions] Release v1.12.0

[Y-Sindo]

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[azure-sdk]

API change check

APIView has identified API level changes in this PR and created following API reviews.

Microsoft.Azure.WebJobs.Extensions.SignalRService

[ArcturusZhang]

@Y-Sindo @JoshLove-msft could you please take a look at this test case?

azure-sdk-for-net/sdk/signalr/Microsoft.Azure.WebJobs.Extensions.SignalRService/tests/DefaultSecurityTokenValidatorTests.cs

Line 37 in dba99f7

public void ValidateSecurityTokenFacts(string tokenString, SecurityTokenStatus expectedStatus)

It is failing on main branch as well when I run that on my local machine.
This issue is seen in this PR: #39931
and here is the log: https://dev.azure.com/azure-sdk/29ec6040-b234-4e31-b139-33dc4287b756/_apis/build/builds/3256030/logs/950

[Y-Sindo]

@ArcturusZhang The test case fails because a hard-coded JWT token expires recently. #39930 Fixed in this PR.