Wrap and stub Sentry for performance investigation

app/assets/javascripts/sentry/wrapper.js

+// Temporarily commented out to investigate performance: https://gitlab.com/gitlab-org/gitlab/-/issues/251179
+// export * from '@sentry/browser';
+
+export function init(...args) {
+  return args;
+}
+
+export function setUser(...args) {
+  return args;
+}
+
+export function captureException(...args) {
+  return args;
+}
+
+export function captureMessage(...args) {
+  return args;
+}
+
+export function withScope(fn) {
+  fn({
+    setTag(...args) {
+      return args;
+    },
+  });
+}