Notify board members about moved cards according to their Deck setting

Replaces the yes/no notify_email flag with notify_mode:
- off:   no mail
- owner: only the board owner, as before (migrated from notify_email=1)
- board: everyone with access to the board, filtered by their own Deck
         "Notifications" setting for it (board:<id>:notify-due: off /
         assigned / all), mirroring Deck's NotificationHelper rules

Recipients are resolved via PermissionService::findUsers() (owner, ACL,
groups and circles expanded), AssignmentMapper::isUserAssigned() and
IConfig, none of which reads Deck's frozen $userId. If they cannot be
resolved, no mail is sent rather than one to the wrong people.

Moved cards are collected over the whole run and each recipient gets a
single digest mail afterwards, in their own language.

Bumps to 35.2.0 so the migrations run.

lib/Db/Workflow.php

@@ -18,8 +18,8 @@ use OCP\DB\Types;
  * @method void setSourceStackId(int $sourceStackId)
  * @method int getTargetStackId()
  * @method void setTargetStackId(int $targetStackId)
- * @method bool getNotifyEmail()
- * @method void setNotifyEmail(bool $notifyEmail)
+ * @method string getNotifyMode()
+ * @method void setNotifyMode(string $notifyMode)
  * @method bool getEnabled()
  * @method void setEnabled(bool $enabled)
  * @method \DateTime|null getLastRun()
@@ -31,7 +31,7 @@ class Workflow extends Entity implements \JsonSerializable {
 	protected $boardId;
 	protected $sourceStackId;
 	protected $targetStackId;
-	protected $notifyEmail;
+	protected $notifyMode;
 	protected $enabled;
 	protected $lastRun;
 
@@ -42,7 +42,7 @@ class Workflow extends Entity implements \JsonSerializable {
 		$this->addType('boardId', Types::INTEGER);
 		$this->addType('sourceStackId', Types::INTEGER);
 		$this->addType('targetStackId', Types::INTEGER);
-		$this->addType('notifyEmail', Types::BOOLEAN);
+		$this->addType('notifyMode', Types::STRING);
 		$this->addType('enabled', Types::BOOLEAN);
 		$this->addType('lastRun', Types::DATETIME);
 	}
@@ -55,7 +55,7 @@ class Workflow extends Entity implements \JsonSerializable {
 			'boardId' => $this->getBoardId(),
 			'sourceStackId' => $this->getSourceStackId(),
 			'targetStackId' => $this->getTargetStackId(),
-			'notifyEmail' => (bool)$this->getNotifyEmail(),
+			'notifyMode' => (string)$this->getNotifyMode(),
 			'enabled' => (bool)$this->getEnabled(),
 			'lastRun' => $this->getLastRun()?->format(\DateTimeInterface::ATOM),
 		];