dev(clean): Fix labels, add address_resolver clarification, xUnit1051

[currantw]

Summary

A few unrelated minor changes:

• Update github-labels.md to reflect use of Milestones instead of release-* labels.
• Add a clarifying comment to address_resolver to show that this functionality is implemented even though the parameter is unused.
• Resolve all xUnit1051 and xUnit1031 warnings and bump them to errors.

Issue Link

⚪ None

Features and Behaviour Changes

No behaviour changes.

Implementation

See summary.

Limitations

⚪ None

Testing

Lint passes. ✅

Related Issues

⚪ None

Checklist

• This Pull Request is related to one issue.
• Commit message has a detailed description of what changed and why.
• Tests are added or updated and all checks pass.
• CHANGELOG.md, README.md, DEVELOPER.md, and other documentation files are updated.
• Destination branch is correct - main or release
• Create merge commit if merging release branch into main, squash otherwise.

[Copilot]

Pull request overview

This PR is a small maintenance/cleanup set that updates project documentation, clarifies Rust FFI behavior, and modernizes tests to comply with stricter xUnit analyzer settings (notably eliminating blocking waits and consistently using TestContext.Current.CancellationToken).

Changes:

• Updated unit/integration tests to avoid blocking task APIs (Task.WaitAll, Task.Wait) and to pass TestContext.Current.CancellationToken where applicable.
• Clarified Rust FFI address_resolver initialization behavior in the connection request construction.
• Updated docs/github-labels.md to reflect milestone-based scheduling and adjusted label documentation; tightened xUnit analyzer severities in .editorconfig.

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests/Valkey.Glide.UnitTests/ScriptTests.cs	Converts concurrency tests to async Task and replaces blocking waits with await Task.WhenAll.
tests/Valkey.Glide.UnitTests/PubSubThreadSafetyTests.cs	Adds TestContext.Current.CancellationToken to async operations and task scheduling in thread-safety tests.
tests/Valkey.Glide.UnitTests/PubSubPerformanceTests.cs	Makes concurrent performance test async and removes blocking waits; uses cancellation token with task scheduling.
tests/Valkey.Glide.UnitTests/PubSubMessageHandlerTests.cs	Converts concurrency/disposal tests to async and replaces blocking waits with await Task.WhenAll.
tests/Valkey.Glide.UnitTests/PubSubGracefulShutdownTests.cs	Threads TestContext.Current.CancellationToken through channel operations and task scheduling.
tests/Valkey.Glide.UnitTests/PubSubFFIMemoryLeakTests.cs	Replaces Task.WaitAll with await Task.WhenAll and adds cancellation token to task scheduling.
tests/Valkey.Glide.IntegrationTests/PubSubReconnectionTests.cs	Uses TestContext.Current.CancellationToken with Task.Delay.
tests/Valkey.Glide.IntegrationTests/PubSubCallbackTests.cs	Uses the test cancellation token when waiting on synchronization primitives.
tests/Valkey.Glide.IntegrationTests/IamAuthTests.cs	Uses TestContext.Current.CancellationToken with Task.Delay calls.
tests/Valkey.Glide.IntegrationTests/ClientSideCacheTests.cs	Uses TestContext.Current.CancellationToken with Task.Delay.
tests/Valkey.Glide.IntegrationTests/BatchTests.cs	Removes blocking waits (Task.Wait) in favor of async delay + completion checks; updates one theory to async Task.
rust/src/ffi.rs	Adds a clarifying comment and reorders address_resolver: None initialization in the request struct literal.
docs/github-labels.md	Updates label workflow documentation to mention milestone scheduling and adds dev label description.
.editorconfig	Bumps xUnit1031 and xUnit1051 analyzer severities to error.

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