Rename skillContentRead telemetry properties to use 'skill' prefix

[AbhitejJohn]

Summary

Renames telemetry properties in the skillContentRead event to add a skill prefix, aligning property names with the event name to reduce ambiguity in the collected data. This was suggested by folks on the data team.

Property Renames

GH telemetry event (sendGHTelemetryEvent)

Old	New
extensionIdHash	skillExtensionIdHash
extensionVersion	skillExtensionVersion
contentHash	skillContentHash

Enhanced GH + Internal MSFT events (plaintext props)

Old	New
extensionId	skillExtensionId
extensionVersion	skillExtensionVersion
contentHash	skillContentHash

Properties that already had the skill prefix (skillName, skillPath, skillStorage, skillNameHash) are unchanged.

Testing

• Updated all relevant telemetry assertions to match the renamed properties
• Aligned the copied workbench implementation and its tests in this repo

[Copilot]

Pull request overview

This PR updates skillContentRead telemetry property names to consistently use a skill* prefix (per data team guidance), and updates tests accordingly. It also adds a workbench-side SkillContentReadTelemetry implementation + test intended to mirror upstream behavior.

Changes:

• Renamed skillContentRead GH telemetry properties in the Copilot readFile tool (extensionIdHash → skillExtensionIdHash, etc.).
• Updated Copilot extension tests to assert the renamed telemetry properties.
• Added a workbench SkillContentReadTelemetry contribution and a corresponding unit test (currently not aligned with the repo’s ILanguageModelToolsService API).

Show a summary per file

File	Description
src/vs/workbench/contrib/chat/test/browser/skillContentReadTelemetry.test.ts	Adds tests for workbench skillContentRead telemetry using renamed skill* properties (but currently references non-existent tool service APIs/types).
src/vs/workbench/contrib/chat/browser/skillContentReadTelemetry.ts	Adds workbench telemetry emission for skill content reads using renamed skill* properties (but currently references non-existent tool service APIs/types).
extensions/copilot/src/extension/tools/node/test/readFile.spec.tsx	Updates assertions and test title strings to the renamed telemetry properties.
extensions/copilot/src/extension/tools/node/readFileTool.tsx	Renames skillContentRead telemetry payload properties to the new skill*-prefixed names.

Copilot's findings

Comments suppressed due to low confidence (2)

src/vs/workbench/contrib/chat/browser/skillContentReadTelemetry.ts:35

• ILanguageModelToolsService currently exposes onDidInvokeTool but does not have onDidCompleteToolInvocation, so this subscription won’t compile. Either switch to the existing event(s) and derive completion via the tool invocation/state model, or extend the service interface + implementation to add a completion event.

		this._register(toolsService.onDidCompleteToolInvocation(e => this._onToolCompleted(e)));
		this._register(this._promptsService.onDidChangeSkills(() => {

src/vs/workbench/contrib/chat/test/browser/skillContentReadTelemetry.test.ts:95

• This test calls mockToolsService.fireOnDidCompleteToolInvocation(...), but MockLanguageModelToolsService in src/vs/workbench/contrib/chat/test/common/tools/mockLanguageModelToolsService.ts only provides fireOnDidInvokeTool and there is no completion event in ILanguageModelToolsService. Update the test to use the actual service API (or add the completion event + mock support as part of this PR).

	async function fireAndAwait(event: IToolCompletedEvent): Promise<void> {
		mockToolsService.fireOnDidCompleteToolInvocation(event);
		// Allow the fire-and-forget async telemetry to complete
		await new Promise<void>(resolve => setTimeout(resolve, 50));

• Files reviewed: 4/4 changed files
• Comments generated: 2