Enable CA1836

[glen-84]

Summary of the changes (Less than 80 chars)

• Enable CA1836.

[Copilot]

Pull request overview

Enables the .NET analyzer rule CA1836 (“Prefer IsEmpty over Count when available”) and updates a few call sites to comply, primarily on concurrent collections in runtime code and polling assertions in tests.

Changes:

• Enable CA1836 as a warning in .editorconfig.
• Replace Count > 0 / Count == 0 emptiness checks with IsEmpty on concurrent collections.
• Update several Mocha integration tests’ polling conditions to use IsEmpty.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/StrawberryShake/Client/src/Transport.WebSockets/Session.cs	Uses ConcurrentDictionary.IsEmpty instead of Count > 0 during disposal.
src/Mocha/test/Mocha.Transport.RabbitMQ.Tests/Behaviors/InboxTests.cs	Uses ConcurrentBag.IsEmpty in polling wait condition.
src/Mocha/test/Mocha.Transport.InMemory.Tests/Behaviors/InboxTests.cs	Uses ConcurrentBag.IsEmpty in polling wait condition.
src/Mocha/test/Mocha.Tests/Outbox/OutboxIntegrationTests.cs	Uses ConcurrentBag.IsEmpty in polling wait conditions.
src/Mocha/test/Mocha.Tests/Inbox/InboxIntegrationTests.cs	Uses ConcurrentBag.IsEmpty in polling wait condition.
src/HotChocolate/Core/src/Types/Utilities/Subscriptions/ObservableSourceStreamAdapter.cs	Uses ConcurrentQueue.IsEmpty instead of Count == 0 before awaiting.
.editorconfig	Adds CA1836 severity configuration.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (6a3b7a3) to head (2e25865).
⚠️ Report is 1005 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #9423       +/-   ##
==========================================
- Coverage   74.16%       0   -74.17%     
==========================================
  Files        2677       0     -2677     
  Lines      140790       0   -140790     
  Branches    16371       0    -16371     
==========================================
- Hits       104421       0   -104421     
+ Misses      30774       0    -30774     
+ Partials     5595       0     -5595     

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