feat: enhance telemetry with error classification and duration tracking for environment manager registration

[eleanorjboyd]

help identify what could be causing discovery errors and which managers may be taking a while to load

[Copilot]

Pull request overview

This PR enhances telemetry tracking for environment manager operations by introducing structured error classification and duration metrics. The changes help identify specific error types (spawn failures, timeouts, permission issues, etc.) and measure performance for environment discovery and manager registration.

Changes:

• Added a new error classification module (errorClassifier.ts) that categorizes errors into telemetry-safe types
• Updated environment discovery telemetry to use classified error types instead of raw error names
• Added duration tracking to environment manager registration via StopWatch
• Added error telemetry for extension manager registration failures in extension.ts

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/common/telemetry/errorClassifier.ts	New module providing classifyError() function that maps errors to structured types (spawn_timeout, spawn_enoent, permission_denied, canceled, parse_error, unknown)
src/internal.api.ts	Updated ENVIRONMENT_DISCOVERY telemetry to use classifyError() for more granular error categorization
src/features/envManagers.ts	Added StopWatch to track and report duration for environment manager registration
src/extension.ts	Added error telemetry in catch block for manager registration failures
src/common/telemetry/constants.ts	Updated GDPR annotations to include duration measurement for ENVIRONMENT_MANAGER_REGISTERED event