Add eslint rule and fix as many issues as possible

frontend/src/pages/api/auth/VerifySignupInvite.ts

@@ -12,10 +12,10 @@ interface Props {
  * @param {string} obj.code - code that a user received to the abovementioned email
  * @returns
  */
-const verifySignupInvite = ({ email, organizationId, code }: Props) => fetch('/api/v1/invite-org/verify', {
-    method: 'POST',
+const verifySignupInvite = ({ email, organizationId, code }: Props) => fetch("/api/v1/invite-org/verify", {
+    method: "POST",
     headers: {
-      'Content-Type': 'application/json'
+      "Content-Type": "application/json"
     },
     body: JSON.stringify({
       email,