executor buffer size should be customisable in no_std #18510
Description
Correct, users currently don't have a way to customise this. To be honest, I don't like that it isn't a dynamic allocation like it is on `std` with `async-executor`. I'm happy to revert this change so that _users_ don't see any difference, and then we follow-up in 0.17 with a larger refactor/re-write of `bevy_tasks` (hopefully including Forte by then).
Originally posted by @bushrat011899 in #18506 (comment)