[MM-39999] Increase key length in plugin KV store to 150 (#19002)

model/plugin_key_value.go

@@ -10,7 +10,7 @@ import (
 
 const (
 	KeyValuePluginIdMaxRunes = 190
-	KeyValueKeyMaxRunes      = 50
+	KeyValueKeyMaxRunes      = 150
 )
 
 type PluginKeyValue struct {