[Report] Add report reopen action for closed reports (#7442)

- New Command_ReportReopen moderator command (extension 1206) with server
  handler that reopens resolved/dismissed reports, resets resolution state
  and notified, and records the reopening note in the audit log
- Reopen... button in the report queue action bar, gated to resolved and
  dismissed reports, with optional note prompt and tooltip
- Success confirmations for Assign, Resolve/Dismiss and Reopen now survive
  the list refresh via a pending status message instead of being clobbered
- Dispatch/auth coverage in server_moderator_role_test

Co-authored-by: Lukas Brübach <Bruebach.Lukas@bdosecurity.de>

cockatrice/src/interface/widgets/tabs/tab_report.h

@@ -56,6 +56,8 @@ private slots:
     void reportDetailsResponse(const Response &response);
     void requestStats();
     void statsResponse(const Response &response);
+    void reopenReport();
+    void reopenResponse(const Response &response);
 
 private:
     int selectedReportId() const;
@@ -87,6 +89,7 @@ private:
     QPushButton *resolveButton;
     QPushButton *resolveWithNoteButton;
     QPushButton *dismissButton;
+    QPushButton *reopenButton;
     QPushButton *viewReplayButton;
     QPushButton *joinGameButton;
     QLabel *statusLabel;
@@ -108,6 +111,7 @@ private:
     QLabel *userContextNotesLabel;
     QLabel *userContextRecentReportsLabel;
     QString lastRequestedUser;
+    QString pendingStatusMessage;
     QGroupBox *statsGroup;
     QLabel *statsTotalLabel;
     QLabel *statsTrendLabel;