ghost: use CompletionsFetchService

[ulugbekna]

No description provided.

[Copilot]

Pull request overview

This pull request refactors the ghost text completion system to use the CompletionsFetchService abstraction layer. This change aims to consolidate the network fetching logic and improve code maintainability by removing duplicate streaming/filtering logic.

Changes:

• Introduces a new fetchAndStreamCompletions2 method in the fetcher service that uses CompletionsFetchService for network requests
• Moves CopilotAnnotation types to a shared platform location for reuse across different parts of the codebase
• Removes the QuotaExceeded error type in favor of handling it through UnsuccessfulResponse with proper status codes
• Simplifies function signatures by removing unused parameters (e.g., triggerCategory, triggerKind)

Reviewed changes

Copilot reviewed 34 out of 34 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
src/platform/completions-core/common/openai/copilotAnnotations.ts	New shared location for CopilotAnnotation types, moved from extension-specific code
src/platform/nesFetch/node/completionsFetchServiceImpl.ts	Updated to return enhanced FetchResponse with requestId and response, removed obsolete headersObjectToKv helper
src/platform/nesFetch/common/responseStream.ts	Added destroy() method and constructor parameters for request tracking
src/platform/nesFetch/common/completionsFetchService.ts	Removed QuotaExceeded error class, updated UnsuccessfulResponse to include headers and text getter
src/platform/networking/common/fetch.ts	Refactored getRequestId to accept IHeaders instead of Response for better reusability
src/extension/completions-core/vscode-node/lib/src/openai/fetch.ts	Added fetchAndStreamCompletions2 implementation with CompletionsFetchService integration and retry logic
src/extension/completions-core/vscode-node/lib/src/ghostText/ghostText.ts	Refactored to use class-based CompletionsFromNetwork and added experiment flag for new fetch service
src/extension/completions-core/vscode-node/lib/src/ghostText/telemetry.ts	Simplified telemetryShown by removing redundant insertionCategory parameter
src/extension/completions-core/vscode-node/lib/src/ghostText/last.ts	Removed unused triggerCategory and triggerKind parameters from acceptance handlers
src/platform/configuration/common/configurationService.ts	Added GhostTextUseCompletionsFetchService experiment configuration flag
test/base/*.ts	Updated test mocks to match new FetchResponse interface with additional fields

Comments suppressed due to low confidence (1)

src/platform/nesFetch/common/responseStream.ts:77

• Missing await. The value 'body' is always a promise.

		if (body && 'destroy' in body && typeof body.destroy === 'function') {