feat(webvitals): Adds useReplaceFidWithInpSetting hook to toggle fid vs inp in web vitals module (#64111)

Adds a `useReplaceFidWithInpSetting` hook to control replacing FID with
INP in the web vitals module

Author: edwardgou-sentry

static/app/views/performance/browser/webVitals/settings.ts

@@ -1 +1,2 @@
 export const USE_STORED_SCORES = false;
+export const REPLACE_FID_WITH_INP = false;

static/app/views/performance/browser/webVitals/utils/useReplaceFidWithInpSetting.tsx

@@ -0,0 +1,20 @@
+import {decodeScalar} from 'sentry/utils/queryString';
+import {useLocation} from 'sentry/utils/useLocation';
+import useOrganization from 'sentry/utils/useOrganization';
+import {REPLACE_FID_WITH_INP} from 'sentry/views/performance/browser/webVitals/settings';
+
+export function useReplaceFidWithInpSetting() {
+  const location = useLocation();
+  const {query} = location;
+  const organization = useOrganization();
+
+  if (query.replaceFidWithInp !== undefined) {
+    return decodeScalar(query.replaceFidWithInp) === 'true';
+  }
+
+  if (organization.features.includes('starfish-browser-webvitals-replace-fid-with-inp')) {
+    return true;
+  }
+
+  return REPLACE_FID_WITH_INP;
+}