DX: fix error overlay flash (#61813)
### What
Skipping module build error and module not found error in
`onUnhandledError` handler from pages router dev overlay, to avoid the
build error being caught twice by error overlay in both unhandled error
and build error type. The unhandled error is slightly eariler than build
error, which causes the flash. We skipped it to avoid display same
duplicated errors.
### Why
This change fixes a flashing UX on error overlay when build error
occurred, it will go from a white background with red text to a source
panel with actual code where triggered build error, such as synatx
error. I recodered two videos to show them properly. Since it happens
too fast, hard to address them with test, more like fixing a minor
frustration in the UI.
### After
https://github.com/vercel/next.js/assets/4800338/59dcde0f-3ac7-419f-ba5c-c28c9d5a7205
### Before
https://github.com/vercel/next.js/assets/4800338/e64e8855-2c5f-43a5-948c-8137cad538a1
Closes NEXT-2403
Closes NEXT-2145
