feat(testing): add Allure-compatible result exporter

[diiviikk5]

Closes #1568

Allure compatibility

Summary

Add a narrow AllureExporter to mofa-testing that converts TestReport results into Allure-compatible JSON result payloads.

What Changed

• added AllureExporter
• added serializable result types:
  • AllureTestResult
  • AllureStatusDetails
  • AllureLabel
  • AllureParameter
• exported the new types through tests/src/report/mod.rs and tests/src/lib.rs
• mapped TestCaseResult status into Allure-compatible status values
• included suite/framework labels
• represented report metadata as Allure parameters
• added export_json() for deterministic JSON payload generation

Why

Even with JSON, text, Markdown, and JUnit-style reporting, mofa-testing still lacked a richer result-export path for teams that want artifact-friendly report consumers. This PR adds that layer without introducing a full Allure runtime integration system.

Testing

Ran:

cargo test -p mofa-testing --test report_tests