Ensure bail out on ssr error in static generation (#68764)
### What
It's regression introduced in #67703 where throwing error in client
component page is not bailing out anymore in static generation. It was
supposed to bail out the build, found by @gnoff
Closes NDX-52
### Why
We're throwing the all the collected render errors for both RSC and SSR
rendering error. But in #67703 we accidentally removed the collection of
SSR rendering error into digested errors map
```js
if (response.digestErrorsMap.size) {
const buildFailingError = response.digestErrorsMap.values().next().value
throw buildFailingError
}
```
We add another check after above for SSR errors, if they're presented
we'll bail with the 1st SSR error.
