fix(e2e): Pin @opentelemetry/api to 1.9.0 in ts3.8 test app

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Note

The pull request "fix(e2e): Pin @opentelemetry/api to 1.9.0 in ts3.8 test app" was created by @logaretm but did not reference an issue. Therefore this issue was created for better visibility in external tools like Linear.

Summary

• @opentelemetry/api@1.9.1 was released on Mar 25 and introduced export { Foo, type Bar } syntax (inline type modifiers) in its .d.ts files, which requires TypeScript 4.5+
• The generic-ts3.8 E2E test runs with skipLibCheck: false and TypeScript 3.8, so it tries to parse OTel's types and fails
• This pins @opentelemetry/api to 1.9.0 in the ts3.8 test app via pnpm.overrides
• We can't pin repo-wide in published packages because OTel uses a global singleton pattern — version mismatches with @opentelemetry/sdk-trace-base cause the tracer to become a no-op
• Our published .d.ts files are unaffected — only OTel's own types use the incompatible syntax

Test plan

• Verified locally: yarn test:run generic-ts3.8 passes with the pin
• CI E2E generic-ts3.8 Test should go green

🤖 Generated with Claude Code

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JS-2010