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

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Summary

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

Motivation

Previously, any code that needed to emit this ADO task step had to hand-craft
TaskStep::new(...) with raw string input keys. This PR introduces a typed
builder struct (new(<required>) + typed optional setters + into_step()) so
the required input is positional, optional inputs are type-checked, and call
sites stop using stringly-typed keys.

Changes

• src/compile/ir/tasks/publish_code_coverage_results.rs: new
  PublishCodeCoverageResults builder struct and its #[cfg(test)] mod tests
  (4 unit tests)
• src/compile/ir/tasks/mod.rs: pub mod publish_code_coverage_results;
  declaration (alphabetical order, between publish_build_artifacts and
  publish_pipeline_artifact)

ADO Task Reference

• Task: PublishCodeCoverageResults@2
• Docs: (https://learn.microsoft.com/en-us/azure/devops/pipelines/tasks/reference/publish-code-coverage-results-v2)
• Required inputs: summaryFileLocation (minimatch glob path to coverage summary XML)
• Optional inputs:
  • pathToSources — absolute path to source files, needed for formats without
    embedded absolute paths (e.g. JaCoCo for Java)
  • failIfCoverageEmpty — fail the step when no coverage data was produced
    (bool, default false)

Validation

• cargo build --all-targets
• cargo test 'tasks::publish_code_coverage_results' — 4 tests pass
• cargo clippy --all-targets --all-features --workspace -- -D warnings

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Created by the ado-task-ir-contributor workflow.

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