Keep web build waits alive longer

[halfaipg]

Summary

• raise the default web-build --wait timeout from 10 to 30 minutes
• keep the explicit --timeout override
• publish as 2.0.0-pre.80

Production reproduction

The real Next build 55c269c7-90c3-4dd1-9170-f0fb33546266 kept building after the CLI timed out at 10 minutes and ultimately ran for 19m43s.

Verification

• npm run check (1,294 tests)
• npm run build
• npm run smoke:help
• regression test completes a simulated build at minute 11 using the default timeout