tests: Remove deprecated Sentry.addTracingExtensions() call.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

web/tests/lib/index.js

@@ -5,7 +5,6 @@ const path = require("node:path");
 
 require("css.escape");
 require("handlebars/runtime");
-const Sentry = require("@sentry/browser");
 const {JSDOM} = require("jsdom");
 const _ = require("lodash");
 
@@ -45,9 +44,6 @@ require("@babel/register")({
     root: path.resolve(__dirname, "../.."),
 });
 
-// Ensure that startTransaction and friends are available at runtime
-Sentry.addTracingExtensions();
-
 // Create a helper function to avoid sneaky delays in tests.
 function immediate(f) {
     return () => f();