chore: remove obsolete SQL files and journal entries for custom notification type

- Deleted SQL file related to the 'custom' notification type and its schema changes.
- Removed corresponding journal entry from the metadata to reflect the deletion of the custom notification type.

apps/dokploy/drizzle/0125_jittery_diamondback.sql

@@ -1,9 +0,0 @@
-ALTER TYPE "public"."notificationType" ADD VALUE 'custom' BEFORE 'lark';--> statement-breakpoint
-CREATE TABLE "custom" (
-	"customId" text PRIMARY KEY NOT NULL,
-	"endpoint" text NOT NULL,
-	"headers" text
-);
---> statement-breakpoint
-ALTER TABLE "notification" ADD COLUMN "customId" text;--> statement-breakpoint
-ALTER TABLE "notification" ADD CONSTRAINT "notification_customId_custom_customId_fk" FOREIGN KEY ("customId") REFERENCES "public"."custom"("customId") ON DELETE cascade ON UPDATE no action;

apps/dokploy/drizzle/meta/_journal.json

@@ -876,13 +876,6 @@
       "when": 1764571454170,
       "tag": "0124_certain_cloak",
       "breakpoints": true
-    },
-    {
-      "idx": 125,
-      "version": "7",
-      "when": 1765134933476,
-      "tag": "0125_jittery_diamondback",
-      "breakpoints": true
     }
   ]
 }