build: remove sentry from the externals list (#61194)

Context:
- on app router, we bundle all the code used both on server and client
- sentry used to be incompatible with that, however a raw require call
on production to Sentry leads to a 350ms impact on cold boots/initial
load
- it might be ok to bundle now, let's try it out


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Closes NEXT-2250

packages/next/src/lib/server-external-packages.json

@@ -8,8 +8,6 @@
   "@mikro-orm/core",
   "@mikro-orm/knex",
   "@prisma/client",
-  "@sentry/nextjs",
-  "@sentry/node",
   "@sentry/profiling-node",
   "@swc/core",
   "argon2",