Add telemetry for chat participant extension id (microsoft#223558)

fix microsoft/vscode-copilot#6889

Author: roblourens

src/vs/workbench/contrib/chat/common/chatServiceImpl.ts

@@ -50,6 +50,7 @@ type ChatProviderInvokedEvent = {
 	requestType: 'string' | 'followup' | 'slashCommand';
 	chatSessionId: string;
 	agent: string;
+	agentExtensionId: string | undefined;
 	slashCommand: string | undefined;
 	location: ChatAgentLocation;
 	citations: number;
@@ -62,6 +63,7 @@ type ChatProviderInvokedClassification = {
 	requestType: { classification: 'SystemMetaData'; purpose: 'FeatureInsight'; comment: 'The type of request that the user made.' };
 	chatSessionId: { classification: 'SystemMetaData'; purpose: 'FeatureInsight'; comment: 'A random ID for the session.' };
 	agent: { classification: 'SystemMetaData'; purpose: 'FeatureInsight'; comment: 'The type of agent used.' };
+	agentExtensionId: { classification: 'SystemMetaData'; purpose: 'FeatureInsight'; comment: 'The extension that contributed the agent.' };
 	slashCommand?: { classification: 'SystemMetaData'; purpose: 'FeatureInsight'; comment: 'The type of slashCommand used.' };
 	location: { classification: 'SystemMetaData'; purpose: 'FeatureInsight'; comment: 'The location at which chat request was made.' };
 	citations: { classification: 'SystemMetaData'; purpose: 'FeatureInsight'; comment: 'The number of public code citations that were returned with the response.' };
@@ -460,6 +462,7 @@ export class ChatService extends Disposable implements IChatService {
 					result: 'cancelled',
 					requestType,
 					agent: agentPart?.agent.id ?? '',
+					agentExtensionId: agentPart?.agent.extensionId.value ?? '',
 					slashCommand: agentSlashCommandPart ? agentSlashCommandPart.command.name : commandPart?.slashCommand.command,
 					chatSessionId: model.sessionId,
 					location,
@@ -547,6 +550,7 @@ export class ChatService extends Disposable implements IChatService {
 						result,
 						requestType,
 						agent: agentPart?.agent.id ?? '',
+						agentExtensionId: agentPart?.agent.extensionId.value ?? '',
 						slashCommand: agentSlashCommandPart ? agentSlashCommandPart.command.name : commandPart?.slashCommand.command,
 						chatSessionId: model.sessionId,
 						location,
@@ -571,6 +575,7 @@ export class ChatService extends Disposable implements IChatService {
 					result,
 					requestType,
 					agent: agentPart?.agent.id ?? '',
+					agentExtensionId: agentPart?.agent.extensionId.value ?? '',
 					slashCommand: agentSlashCommandPart ? agentSlashCommandPart.command.name : commandPart?.slashCommand.command,
 					chatSessionId: model.sessionId,
 					location,