add a no-std platform target to CI

[BenjaminBrienen]

What problem does this solve or what need does it fill?

Using bevy in no-std contexts would be a cool feature. Supporting no-std is considered to be an advantage.

What solution would you like?

Adding a no-std target to the CI would ensure that bevy has proper support.

Additional context

https://github.com/bevyengine/bevy/pull/15279#pullrequestreview-2311411460

https://github.com/bevyengine/bevy/issues/15460

[BenjaminBrienen]

Blocked on actually implementing support for no-std. https://github.com/bevyengine/bevy/issues/15460

[BenjaminBrienen]

Already fixed