Partial work towards https://github.com/flutter/flutter/issues/132245.

The goal here is to "sniff" out any missing pieces that would block engine builds, rolls, benchmarks and so on before requiring humans to provide the parameter. The implementation is based on a [short discussion with @christopherfujino](https://discord.com/channels/608014603317936148/608022056616853515/1141503921546875110):

@matanlurey:

> Not sure whether to post here or ⁠hackers-infra-🌡 , but is there a way to (and is it advisable to) detect whether the tool is running in a CI environment? I'd like to "soft enforce" --local-engine-host being provided strictly on CI, make sure that lands well, and then "upgrade" it to being non-CI invocations as well (re: https://github.com/flutter/flutter/issues/132245).
>
> Also happy to get talked out of this idea 🙂

@christopherfujino:

> we have a check, lemme find it
> whether or not it is advisable, idk
> https://github.com/flutter/flutter/blob/flutter-3.14-candidate.0/packages/flutter_tools/lib/src/base/bot_detector.dart#L30
>
> (...)
>
> is your desire to get early signal before enforcing t his for humans to prevent functionality churn of landing and reverting and re-landing? 
>
> (yes)
>
> uhh, sure, that's advisable 🙂