Await makeNewIssueFile to fix Edit Description button race condition (#8420)

* Initial plan

* Fix: Await makeNewIssueFile in Edit Description button handler

Co-authored-by: alexr00 <38270282+alexr00@users.noreply.github.com>

* Also await makeNewIssueFile in createIssue method

Co-authored-by: alexr00 <38270282+alexr00@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: alexr00 <38270282+alexr00@users.noreply.github.com>

Author: Copilot

src/issues/issueFeatureRegistrar.ts

@@ -773,7 +773,7 @@ export class IssueFeatureRegistrar extends Disposable {
 				assignees: template.assignees,
 			};
 		}
-		this.makeNewIssueFile(uri, options);
+		await this.makeNewIssueFile(uri, options);
 	}
 
 	async createIssueFromFile() {
@@ -1120,7 +1120,7 @@ export class IssueFeatureRegistrar extends Disposable {
 			quickInput.busy = true;
 			this.createIssueInfo = { document, newIssue, lineNumber, insertIndex };
 
-			this.makeNewIssueFile(document.uri, { title, body, assignees });
+			await this.makeNewIssueFile(document.uri, { title, body, assignees });
 			quickInput.busy = false;
 			quickInput.hide();
 		});