Remove redundant "Open Changes" button from Copilot remote agent chat response (#7434)

* Initial plan

* Remove redundant "Open Changes" button from Copilot remote agent chat response

The multi-file diff part already provides inline file changes viewing, making the separate "Open Changes" button redundant. This change removes the button from the streamSessionLogs method while keeping the multi-file diff functionality intact.

Co-authored-by: rebornix <876920+rebornix@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: rebornix <876920+rebornix@users.noreply.github.com>

Author: Copilot

src/github/copilotRemoteAgent.ts

@@ -1201,12 +1201,6 @@ export class CopilotRemoteAgentManager extends Disposable {
 					stream.push(multiDiffPart);
 				}
 
-				stream.push(new vscode.ChatResponseCommandButtonPart({
-					title: vscode.l10n.t('Open Changes'),
-					command: 'pr.openChanges',
-					arguments: [pullRequest]
-				}));
-
 				resolve();
 			};