Alter hook_task TEXT fields to LONGTEXT (#20038)

Mysql TEXT has a limit of 64KB, change this to LONGTEXT in mysql only so we can have bigger hook payloads.

Postgresql has unlimited TEXT - https://www.postgresql.org/docs/current/datatype-character.html
Sqlite has unlimited TEXT - https://www.sqlitetutorial.net/sqlite-data-types/#:~:text=The%20maximum%20length%20of%20TEXT,SQLite%20supports%20various%20character%20encodings.

Same issue as #16656 but for hook_task

Fixes #10252, #19679, #3561

models/webhook/hooktask.go

@@ -105,7 +105,7 @@ type HookTask struct {
 	HookID          int64
 	UUID            string
 	api.Payloader   `xorm:"-"`
-	PayloadContent  string `xorm:"TEXT"`
+	PayloadContent  string `xorm:"LONGTEXT"`
 	EventType       HookEventType
 	IsDelivered     bool
 	Delivered       int64
@@ -113,9 +113,9 @@ type HookTask struct {
 
 	// History info.
 	IsSucceed       bool
-	RequestContent  string        `xorm:"TEXT"`
+	RequestContent  string        `xorm:"LONGTEXT"`
 	RequestInfo     *HookRequest  `xorm:"-"`
-	ResponseContent string        `xorm:"TEXT"`
+	ResponseContent string        `xorm:"LONGTEXT"`
 	ResponseInfo    *HookResponse `xorm:"-"`
 }