Implement ticket links and blocker state

app/Actions/Tickets/UpdateProjectTicket.php

@@ -18,9 +18,12 @@ class UpdateProjectTicket
     /**
      * @param  array{
      *     acceptance_criteria: string|null,
+     *     blocked_comment: string|null,
      *     description: string|null,
+     *     is_blocked: bool,
      *     ticket_priority_id: int,
      *     ticket_type_id: int,
+     *     parent_ticket_id: int|null,
      *     title: string
      * }  $ticketAttributes
      * @param  array<int, array{
@@ -36,6 +39,10 @@ class UpdateProjectTicket
         array $fieldValueAttributes,
     ): bool {
         return DB::transaction(function () use ($actor, $fieldValueAttributes, $ticket, $ticketAttributes): bool {
+            if (! $ticketAttributes['is_blocked']) {
+                $ticketAttributes['blocked_comment'] = null;
+            }
+
             $ticket->loadMissing([
                 'fieldValues.ticketFieldDefinition',
                 'fieldValues.userValue',
@@ -88,6 +95,14 @@ class UpdateProjectTicket
                 $ticket->acceptance_criteria,
                 $ticketAttributes['acceptance_criteria'],
             );
+            $this->trackScalarChange(
+                $changes,
+                $summaryLabels,
+                'blocked_comment',
+                'blocker comment',
+                $ticket->blocked_comment,
+                $ticketAttributes['blocked_comment'],
+            );
 
             if ($ticket->ticket_type_id !== $ticketAttributes['ticket_type_id']) {
                 $changes['ticket_type'] = [
@@ -105,6 +120,14 @@ class UpdateProjectTicket
                 $summaryLabels[] = 'priority';
             }
 
+            if ($ticket->is_blocked !== $ticketAttributes['is_blocked']) {
+                $changes['is_blocked'] = [
+                    'from' => $ticket->is_blocked,
+                    'to' => $ticketAttributes['is_blocked'],
+                ];
+                $summaryLabels[] = 'blocked state';
+            }
+
             if ($ticket->parent_ticket_id !== $ticketAttributes['parent_ticket_id']) {
                 $newParentTicket = $ticketAttributes['parent_ticket_id'] === null
                     ? null