MM-53924 - Implement push notifications plugin hook and plugin api method (#24350)

* Revert "MM-52804 - Implement SendPushNotification plugin api method (#24273)"

This reverts commit 8418eefb75.

* Revert "MM-53924 - Implement NotificationWillBePushed plugin hook (#24263)"

This reverts commit f13a531bca.

* implement NotificationWillBePushed plugin hook

* implement SendPushNotification plugin api method

* move where we're setting post and channel type

* fix comment

---------

Co-authored-by: Mattermost Build <build@mattermost.com>

server/public/model/push_notification.go

@@ -44,29 +44,31 @@ type PushNotificationAck struct {
 }
 
 type PushNotification struct {
-	AckId            string `json:"ack_id"`
-	Platform         string `json:"platform"`
-	ServerId         string `json:"server_id"`
-	DeviceId         string `json:"device_id"`
-	PostId           string `json:"post_id"`
-	Category         string `json:"category,omitempty"`
-	Sound            string `json:"sound,omitempty"`
-	Message          string `json:"message,omitempty"`
-	Badge            int    `json:"badge,omitempty"`
-	ContentAvailable int    `json:"cont_ava,omitempty"`
-	TeamId           string `json:"team_id,omitempty"`
-	ChannelId        string `json:"channel_id,omitempty"`
-	RootId           string `json:"root_id,omitempty"`
-	ChannelName      string `json:"channel_name,omitempty"`
-	Type             string `json:"type,omitempty"`
-	SenderId         string `json:"sender_id,omitempty"`
-	SenderName       string `json:"sender_name,omitempty"`
-	OverrideUsername string `json:"override_username,omitempty"`
-	OverrideIconURL  string `json:"override_icon_url,omitempty"`
-	FromWebhook      string `json:"from_webhook,omitempty"`
-	Version          string `json:"version,omitempty"`
-	IsCRTEnabled     bool   `json:"is_crt_enabled"`
-	IsIdLoaded       bool   `json:"is_id_loaded"`
+	AckId            string      `json:"ack_id"`
+	Platform         string      `json:"platform"`
+	ServerId         string      `json:"server_id"`
+	DeviceId         string      `json:"device_id"`
+	PostId           string      `json:"post_id"`
+	Category         string      `json:"category,omitempty"`
+	Sound            string      `json:"sound,omitempty"`
+	Message          string      `json:"message,omitempty"`
+	Badge            int         `json:"badge,omitempty"`
+	ContentAvailable int         `json:"cont_ava,omitempty"`
+	TeamId           string      `json:"team_id,omitempty"`
+	ChannelId        string      `json:"channel_id,omitempty"`
+	RootId           string      `json:"root_id,omitempty"`
+	ChannelName      string      `json:"channel_name,omitempty"`
+	Type             string      `json:"type,omitempty"`
+	SenderId         string      `json:"sender_id,omitempty"`
+	SenderName       string      `json:"sender_name,omitempty"`
+	OverrideUsername string      `json:"override_username,omitempty"`
+	OverrideIconURL  string      `json:"override_icon_url,omitempty"`
+	FromWebhook      string      `json:"from_webhook,omitempty"`
+	Version          string      `json:"version,omitempty"`
+	IsCRTEnabled     bool        `json:"is_crt_enabled"`
+	IsIdLoaded       bool        `json:"is_id_loaded"`
+	PostType         string      `json:"-"`
+	ChannelType      ChannelType `json:"-"`
 }
 
 func (pn *PushNotification) DeepCopy() *PushNotification {