Remove service account JSON requirement from GCP Auth

backend/src/db/migrations/20240509235819_identity-gcp-auth.ts

@@ -14,9 +14,6 @@ export async function up(knex: Knex): Promise<void> {
       t.timestamps(true, true, true);
       t.uuid("identityId").notNullable().unique();
       t.foreign("identityId").references("id").inTable(TableName.Identity).onDelete("CASCADE");
-      t.text("encryptedCredentials").notNullable();
-      t.string("credentialsIV").notNullable();
-      t.string("credentialsTag").notNullable();
       t.string("type").notNullable();
       t.string("allowedServiceAccounts").notNullable();
       t.string("allowedProjects").notNullable();

backend/src/db/schemas/identity-gcp-auths.ts

@@ -16,9 +16,6 @@ export const IdentityGcpAuthsSchema = z.object({
   createdAt: z.date(),
   updatedAt: z.date(),
   identityId: z.string().uuid(),
-  encryptedCredentials: z.string(),
-  credentialsIV: z.string(),
-  credentialsTag: z.string(),
   type: z.string(),
   allowedServiceAccounts: z.string(),
   allowedProjects: z.string(),