ghost: refactor sending accepted/dismissed telemetry and minor fixes

[ulugbekna]

No description provided.

[Copilot]

Pull request overview

This PR refactors the ghost text completion system to remove the command-based approach for handling accepted/dismissed telemetry in favor of a more direct approach using the handleEndOfLifetime lifecycle method.

Key Changes

• Removed the command-based acceptance flow (_github.copilot.ghostTextPostInsert2) in favor of handling acceptance directly in handleEndOfLifetime
• Introduced typed interfaces (GhostTextCompletionItem, GhostTextCompletionList) to store completion metadata directly rather than in command arguments
• Fixed the type signature for partial acceptance from the incorrect intersection type number & PartialAcceptInfo to the correct union type number | PartialAcceptInfo
• Refactored survey signal usage to call ISurveyService.signalUsage() directly instead of via command execution
• Improved error reporting by correcting exception handler method names

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
src/extension/survey/vscode-node/surveyCommands.ts	Exported the survey command ID constant (no longer used elsewhere after refactoring)
src/extension/completions-core/vscode-node/extension/src/inlineCompletion.ts	Updated to use new GhostTextCompletionItem type, fixed type signature for partial accept, and corrected error messages in exception handlers
src/extension/completions-core/vscode-node/extension/src/ghostText/ghostText.ts	Major refactoring: removed command-based approach, added typed interfaces, moved telemetry handling to handleEndOfLifetime with a switch statement on reason kinds, and integrated direct survey service calls
src/extension/completions-core/vscode-node/completionsServiceBridges.ts	Removed the now-obsolete registerGhostTextDependencies function call that was registering the command