Quarantine HubConnectionCanSendAndReceiveGroupMessages test

[Copilot]

The HubConnectionCanSendAndReceiveGroupMessages test in the SignalR StackExchange Redis tests is failing due to Docker infrastructure issues in the CI environment. The test is experiencing Docker container creation failures with the error:

Command '/usr/bin/docker run --rm -p 6379:6379 --name redisTestContainer -d redis' failed with exit code '127'. Output:
docker: open /datadisks/disk1/docker/tmp/GetImageBlob3428286899: no such file or directory.

This change quarantines the test by adding the QuarantinedTest attribute to temporarily disable it until the underlying Docker infrastructure issue can be resolved. This follows the established pattern used by other quarantined tests in the same file and across the repository.

The change is minimal and surgical - adding only one line to mark the test as quarantined while preserving all existing test logic for when the infrastructure issue is fixed.

Fixes #62435.

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[javiercn]

Apply the Quarantine attribute using #62435 as the Url. Look at how is done in other samples on the repo

[Copilot]

Apply the Quarantine attribute using #62435 as the Url. Look at how is done in other samples on the repo

Fixed the attribute placement to follow the standard pattern used throughout the repository. The [QuarantinedTest] attribute is now positioned after the other test attributes, matching the pattern used by other quarantined tests. Commit: a2d398d

[javiercn]

Quarantine all these tests with the same URL

Microsoft.AspNetCore.SignalR.StackExchangeRedis.Tests.RedisEndToEndTests.HubConnectionCanSendAndReceiveGroupMessages
Microsoft.AspNetCore.SignalR.StackExchangeRedis.Tests.RedisEndToEndTests.StatefulReconnectPreservesMessageFromOtherServer
Microsoft.AspNetCore.SignalR.StackExchangeRedis.Tests.RedisEndToEndTests.CanSendAndReceiveUserMessagesWhenOneConnectionWithUserDisconnects
Microsoft.AspNetCore.SignalR.StackExchangeRedis.Tests.RedisEndToEndTests.HubConnectionCanSendAndReceiveGroupMessagesGroupNameWithPatternIsTreatedAsLiteral
Microsoft.AspNetCore.SignalR.StackExchangeRedis.Tests.RedisEndToEndTests.HubConnectionCanSendAndReceiveMessages

[Copilot]

Quarantine all these tests with the same URL

Microsoft.AspNetCore.SignalR.StackExchangeRedis.Tests.RedisEndToEndTests.HubConnectionCanSendAndReceiveGroupMessages
...

All five tests have been quarantined with the same URL as requested. Each test now has the [QuarantinedTest("https://github.com/dotnet/aspnetcore/issues/62435")] attribute. Commit: 20ca2069