fix(cli): surface serve staging errors

[7ttp]

TL;DR

fixes functions serve and supabase start failing with only An error occurred in Effect.tryPromise
when an env file read or a runtime staging write fails,
which was caused by bare Effect.tryPromise call sites whose
UnknownError wrapper is itself an Error so the piped mapError guards returned the generic wrapper unchanged..

and is now fixed by converting the five serve call sites to the try and catch form so the raw
filesystem error reaches the user.
Also pins the gen types pflag consumption test on a deterministic container inspect failure instead of depending on nothing listening on the local db port...

ref:

• extends: fix(cli): ensure temp directory #5904