print reason for compilation (#47190)
### What?
add reason of compilation to the `updated in` message.
### Why?
the general update in message is confusing and didn't show what is
happening.
Sometimes people are confused why turbopack compiles something. The new
messages explain that turbopack timings measure request handing duration
in addition to pure compilation time.
### How?
depends on https://github.com/vercel/turbo/pull/4208
fixes WEB-722
