feat(testing): support alternative semantic index endpoints

[rwoll]

This follow-up tightens the scenario-automation Blackbird path added in this PR by aligning behavior with production expectations from review feedback. It closes gaps around glob filtering, cancellation propagation, and robustness of response handling, and adds focused unit coverage for this integration point.

• Service behavior updates

  • ScenarioAutomationWorkspaceChunkSearchService.searchFileChunks now applies WorkspaceChunkSearchOptions.globPatterns (include/exclude) before emitting chunks.
  • Request cancellation is now wired end-to-end via IFetcherService.makeAbortController() and signal, with graceful empty-result returns on abort.
  • JSON parsing is wrapped to treat malformed responses as non-fatal ({ chunks: [] }) with error logging parity to other failure paths.
  • CancellationToken import was converted to type-only in this file.

• New targeted unit tests

  • Added scenarioAutomationWorkspaceChunkSearchService.spec.ts under platform/workspaceChunkSearch/test/node/.
  • Covers:
    • request payload shape to localhost Blackbird endpoint
    • include and exclude glob filtering behavior
    • non-OK response fallback
    • invalid JSON fallback
    • cancellation/abort wiring and cancellation path handling

const abortController = this._fetcherService.makeAbortController();
const tokenListener = token.onCancellationRequested(() => abortController.abort());

response = await this._fetcherService.fetch(BLACKBIRD_EMBEDDINGS_URL, {
	callSite: 'ScenarioAutomationWorkspaceChunkSearchService.searchFileChunks',
	method: 'POST',
	headers: { 'Content-Type': 'application/json' },
	body: JSON.stringify(requestBody),
	signal: abortController.signal,
});

[Copilot]

Pull request overview

This PR adds scenario-automation-specific semantic search support by introducing a lightweight workspace chunk search service that queries a local Blackbird embeddings endpoint, and by adjusting service registrations and endpoint resolution behavior to better support MSBench runs.

Changes:

• Add ScenarioAutomationWorkspaceChunkSearchService that directly calls http://localhost:4443/api/embeddings/code/search for embeddings-based search.
• Add a fallback in ScenarioAutomationEndpointProviderImpl.getChatEndpoint to use copilot-base when resolving a model family fails in scenario automation.
• Refactor service registrations so IWorkspaceChunkSearchService is selected per scenario-automation vs production branch, while GitHub code search-related services are registered unconditionally.

Show a summary per file

File	Description
extensions/copilot/src/platform/workspaceChunkSearch/node/scenarioAutomationWorkspaceChunkSearchService.ts	New scenario-automation chunk search implementation that calls a local embeddings endpoint and parses results into FileChunkAndScore.
extensions/copilot/src/extension/prompt/vscode-node/scenarioAutomationEndpointProviderImpl.ts	Adds try/catch fallback to copilot-base when model family resolution fails under scenario automation.
extensions/copilot/src/extension/extension/vscode-node/services.ts	Moves IWorkspaceChunkSearchService registration into the scenario-automation branch and hoists GitHub code search service registrations to the shared section.

Copilot's findings

• Files reviewed: 3/3 changed files
• Comments generated: 5

[rwoll]

@copilot apply changes based on the comments in this thread

[Copilot]

@copilot apply changes based on the comments in this thread

Implemented the requested thread feedback in commit 227bd4b: wired cancellation into the fetch call, applied glob include/exclude filtering, switched CancellationToken to a type import, and added unit tests covering request payload, filtering, non-OK responses, invalid JSON, and cancellation behavior.

[github-actions]

Screenshot Changes

Base: eb014b61 Current: 9ff5d936

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