Remove service account JSON requirement from GCP Auth

backend/src/services/identity-gcp-auth/identity-gcp-auth-validators.ts

@@ -1,15 +1,5 @@
 import { z } from "zod";
 
-import { IdentityGcpAuthsSchema } from "@app/db/schemas";
-
-export const ModifiedIdentityGcpAuthsSchema = IdentityGcpAuthsSchema.omit({
-  encryptedCredentials: true,
-  credentialsIV: true,
-  credentialsTag: true
-}).extend({
-  credentials: z.string()
-});
-
 export const validateGcpAuthField = z
   .string()
   .trim()