Add integration test project to validate example projects build successfully

[Copilot]

Description

Adds test/Dapr.IntegrationTest.Examples — an xUnit test project that automatically discovers all .csproj files under examples/ and validates they compile against the current SDK source. This catches breaking API changes, missing types, and dependency issues before they ship.

• Auto-discovery: Finds all example projects via filesystem scan — new examples are covered automatically with no test updates needed
• Build validation: Parameterized [Theory] runs dotnet build --framework net10.0 on each example project
• Exclusions: Hosting/ examples are excluded (external Aspire SDK NuGet deps, not testing source-level SDK compat)
• CI-safe: 5-min per-project timeout, process tree cleanup, serial execution to avoid build contention

[Theory]
[MemberData(nameof(GetExampleProjects))]
public async Task ExampleProject_ShouldBuildSuccessfully(string relativeProjectPath)
{
    var fullPath = Path.Combine(repoRoot, "examples", relativeProjectPath);
    var (exitCode, output) = await RunDotnetBuildAsync(fullPath);
    Assert.True(exitCode == 0, $"Build failed for '{relativeProjectPath}':\n{output}");
}

Issue reference

Checklist

• Code compiles correctly
• Created/updated tests
• Extended the documentation

[WhitWaldo]

@copilot Please resolve the merge conflict

[Copilot]

@copilot Please resolve the merge conflict

Resolved the merge conflict in all.sln — both the new Dapr.IntegrationTest.Examples project and the WorkflowRetryPolicy example from master are now included. See merge commit 73279fe.

[WhitWaldo]

@copilot Please fix the merge conflicts

[Copilot]

@copilot Please fix the merge conflicts

Resolved the merge conflict in all.sln — both Dapr.IntegrationTest.Examples and Dapr.IntegrationTest.Actors.Generators (from #1791) are now included. See merge commit 284edb1.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.37%. Comparing base (7585d2d) to head (e77d8de).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1792      +/-   ##
==========================================
- Coverage   62.39%   62.37%   -0.02%     
==========================================
  Files         285      285              
  Lines        8421     8421              
  Branches      980      980              
==========================================
- Hits         5254     5253       -1     
  Misses       2935     2935              
- Partials      232      233       +1     

Flag	Coverage Δ
net10.0	62.36% <ø> (-0.02%)	⬇️

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[WhitWaldo]

Please remove the unnecessary test

[WhitWaldo]

This test is unnecessary

[Copilot]

Removed the WorkflowUnitTestExample_ShouldPassTests test and its RunDotnetTestAsync helper in e77d8de.