chore(util-user-agent-node): read typescript package.json version from process.cwd()

[trivikr]

Issue

Internal JS-6675

Description

If version can't be derived from typescript package.json path from current directory, attempt to read is from typescript package.json version derived from process.cwd()

Testing

CI

Checklist

• If the PR is a feature, add integration tests (*.integ.spec.ts) or E2E tests.
  • It's not a feature.
  • Integration tests were written in test: detect typescript installed in current working directory trivikr/test-aws-sdk-js-typescript-detection#16
• My E2E tests are resilient to concurrent i/o.
  • I didn't write any E2E tests.
• I added access level annotations e.g. @public, @internal tags and enabled doc generation on the package. Remember that access level annotations go below the description, not above.
  • I didn't add any public functions.
• Streams - how do they work?? My WebStream readers/locks are properly lifecycled. Node.js stream backpressure is handled. Error handling.
  • No streams here.

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[Copilot]

Pull request overview

Updates TypeScript version detection for the Node user-agent helper by trying multiple candidate typescript/package.json locations, including one derived from process.cwd(), and adjusts tests accordingly.

Changes:

• Replace single-path TypeScript package.json resolution with multi-path lookup (process.cwd() + path derived from __dirname).
• Add getTypeScriptPackageJsonPaths helper (and unit tests) and remove the old single-path helper.
• Expand getTypeScriptUserAgentPair unit tests to cover multi-path and caching behavior.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
packages-internal/util-user-agent-node/src/getTypeScriptUserAgentPair.ts	Tries multiple typescript/package.json paths and caches the resolved version (or failure).
packages-internal/util-user-agent-node/src/getTypeScriptUserAgentPair.spec.ts	Adds coverage for multi-path success/failure and caching semantics.
packages-internal/util-user-agent-node/src/getTypeScriptPackageJsonPaths.ts	New helper that returns candidate typescript/package.json paths (cwd + derived-from-dirname).
packages-internal/util-user-agent-node/src/getTypeScriptPackageJsonPaths.spec.ts	New unit tests for the path derivation logic and deduping behavior.
packages-internal/util-user-agent-node/src/getTypeScriptPackageJsonPath.ts	Removed in favor of the new multi-path helper.
packages-internal/util-user-agent-node/src/getTypeScriptPackageJsonPath.spec.ts	Removed alongside the deprecated helper.

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