feat(ir): add typed builder for VSTest@2

[github-actions]

Summary

Adds a typed builder struct for VSTest@2 to the ado-aw IR.

Motivation

Previously, any code needing to emit a VSTest@2 step had to hand-craft
TaskStep::new("VSTest@2", ...) with raw string input keys. This PR
introduces a typed builder following the command-enum pattern (modelled
on src/compile/ir/tasks/docker.rs) so:

• The testSelector mode is expressed as a typed enum (VsTestSelector)
  with three variants, each carrying its own required/optional inputs.
• Applying an input to the wrong selector (e.g. a testAssemblyVer2
  pattern to a testPlan selector) is unrepresentable.
• Options common to all selectors (code coverage, parallel execution,
  run settings file, test run title, VS version pinning, etc.) live on
  the VsTest builder itself and are emitted only when explicitly set.

Changes

• src/compile/ir/tasks/vstest.rs — new VsTest builder with:
  • VsTestVersion enum (Latest, V17, V16, V15, V14, ToolsInstaller)
  • VsTestAssemblies data struct (testSelector=testAssemblies)
  • VsTestPlan data struct (testSelector=testPlan)
  • VsTestRun data struct (testSelector=testRun)
  • VsTestSelector command enum wrapping the three variants
  • VsTest top-level builder with factory methods and common option setters
  • #[cfg(test)] mod tests with 8 test cases
• src/compile/ir/tasks/mod.rs — pub mod vstest; declaration (alphabetical order)

ADO Task Reference

• Task: VSTest@2
• Docs: (https://learn.microsoft.com/en-us/azure/devops/pipelines/tasks/reference/vstest-v2)
• Selector inputs: testAssemblies (default), testPlan, testRun
• Key optional inputs: codeCoverageEnabled, runInParallel, vsTestVersion,
  runSettingsFile, testRunTitle, platform, configuration,
  publishRunAttachments, runTestsInIsolation, pathtoCustomTestAdapters,
  overrideTestrunParameters, otherConsoleOptions, searchFolder, resultsFolder

Validation

• cargo build --all-targets
• cargo test
• cargo clippy --all-targets --all-features --workspace -- -D warnings

---

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