Add integration and performance test workflows

[Jackson Weber (JacksonWeber)]

Summary

• add a built-package OTLP integration test and dedicated PR validation job
• add base-vs-candidate span benchmarks with a 15% regression gate
• upload benchmark JSON and Markdown report artifacts for review

Validation

• npm run format
• npm run lint
• npm run build
• npm run test:integration
• benchmark and comparison smoke tests

[Copilot]

Pull request overview

Adds CI coverage for end-to-end OTLP export from the built distribution and introduces a baseline-vs-candidate performance benchmark workflow with regression gating, producing artifacts for PR review.

Changes:

• Add a built-package OTLP HTTP integration test and wire it into PR validation.
• Add performance benchmark + comparison scripts with a regression threshold gate and artifact reporting.
• Extend package scripts/formatting targets to include new integration/perf .mjs files.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
test/integration/built-package-otlp.test.mjs	New Node test that spawns the built distro and verifies it exports OTLP trace payloads to a local HTTP collector.
perf/compare.mjs	New comparison tool to generate a Markdown report and fail the job on gated regressions over a threshold.
perf/benchmark.mjs	New benchmark harness that measures span creation overhead from a built distro and writes results JSON.
package.json	Adds integration/performance test scripts and updates prettier globs to format new .mjs files.
.github/workflows/pr-validation.yml	Adds a dedicated integration test job to PR validation.
.github/workflows/performance.yml	Adds a PR-triggered performance workflow comparing base vs PR results and uploading artifacts.

Suppressed comments (1)

perf/benchmark.mjs:79

• To keep baseline vs candidate runs comparable (and avoid API version skew), resolve @opentelemetry/api from the packageRoot being benchmarked rather than from the harness checkout.

const distroEntryPoint = pathToFileURL(join(packageRoot, "dist", "esm", "index.js")).href;
process.env.MICROSOFT_OTEL_SDKSTATS_DISABLED = "true";
const { shutdownMicrosoftOpenTelemetry, useMicrosoftOpenTelemetry } = await import(
  distroEntryPoint
);

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