@githubpr doesn't know PR assignees (#7356)

Fixes #7349

Author: alexr00

src/lm/tools/fetchIssueTool.ts

@@ -6,6 +6,7 @@
 
 import * as vscode from 'vscode';
 import { InMemFileChange } from '../../common/file';
+import { isTeam } from '../../github/interface';
 import { PullRequestModel } from '../../github/pullRequestModel';
 import { RepoToolBase } from './toolsUtils';
 
@@ -32,6 +33,9 @@ export interface FetchIssueResult {
 	owner?: string;
 	repo?: string;
 	fileChanges?: FileChange[];
+	author?: string;
+	assignees?: string[];
+	reviewers?: string[];
 }
 
 export class FetchIssueTool extends RepoToolBase<FetchIssueToolParameters> {
@@ -52,7 +56,10 @@ export class FetchIssueTool extends RepoToolBase<FetchIssueToolParameters> {
 			repo: name,
 			title: issueOrPullRequest.title,
 			body: issueOrPullRequest.body,
-			comments: issueOrPullRequest.item.comments?.map(c => ({ body: c.body, author: c.author.login })) ?? []
+			comments: issueOrPullRequest.item.comments?.map(c => ({ body: c.body, author: c.author.login })) ?? [],
+			author: issueOrPullRequest.author?.login,
+			assignees: issueOrPullRequest.assignees?.map(a => a.login),
+			reviewers: issueOrPullRequest instanceof PullRequestModel ? issueOrPullRequest.reviewers?.map(r => isTeam(r) ? r.name : r.login).filter((login): login is string => !!login) : undefined
 		};
 		if (issueOrPullRequest instanceof PullRequestModel && issueOrPullRequest.isResolved()) {
 			const fileChanges = await issueOrPullRequest.getFileChangesInfo();