Add DoNotUseThreadSleepAnalyzer to warn against Thread.Sleep in async…

[SergeyTeplyakov]

… methods

[Copilot]

Pull Request Overview

This PR introduces a new analyzer to flag uses of Thread.Sleep inside asynchronous contexts.

• Adds a diagnostic descriptor (EPC33) to DiagnosticDescriptors
• Implements DoNotUseThreadSleepAnalyzer and supporting extension methods
• Updates tests and release notes for the new rule

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/ErrorProne.NET.CoreAnalyzers/DiagnosticDescriptors.cs	Declares a new EPC33 descriptor for banning Thread.Sleep in async methods
src/ErrorProne.NET.CoreAnalyzers/CompilationExtensions.cs	Adds FindEnclosingMethodSymbol and FindParentLocalOrLambdaSymbol extensions
src/ErrorProne.NET.CoreAnalyzers/AsyncAnalyzers/DoNotUseThreadSleepAnalyzer.cs	Implements the analyzer logic and registers the rule
src/ErrorProne.NET.CoreAnalyzers/AnalyzerReleases.Unshipped.md	Documents the new EPC33 entry in release notes
src/ErrorProne.NET.CoreAnalyzers.Tests/AsyncAnalyzers/DoNotUseThreadSleepAnalyzerTests.cs	Adds comprehensive tests covering async methods, lambdas, and local functions

Comments suppressed due to low confidence (1)

src/ErrorProne.NET.CoreAnalyzers/AsyncAnalyzers/DoNotUseThreadSleepAnalyzer.cs:19

• The collection expression '[Rule]' does not correctly initialize an ImmutableArray. Use ImmutableArray.Create(Rule) or ImmutableArray.CreateRange(new[] { Rule }) instead.

        public override ImmutableArray<DiagnosticDescriptor> SupportedDiagnostics => [Rule];