Adds warning if lint/fmt/fix runs on a target using a non-local environment.

[chrisjrn]

This adds a warning if a target-based fmt/lint/fix operation runs against a target that specifies a non-local environment.

To property use environments, we'll need a way of making the partitioning rules a bit more pluggable, or decide that individual back-end implementations will be responsible for deciding where they run (which is probably also not great).

Addresses #17129.

[chrisjrn]

@thejcannon If I've missed anywhere that this warning could reasonably be displayed, do let me know!

[stuhood]

Thanks.

These warnings will definitely require followup: I'd feel a little bit better with a tracking ticket that covers actually using environments for lint/fix/fmt/check.