rustic-cargo-test always prompts yes-or-no, should respect compilation-always-kill

[anderspapitto]

I regularly kick off some tests (with rustic-cargo-test), and then, since they take a while, edit the code and want to recompile/restart the test/etc, before the original tests have completed. Rustic hits me with this annoying prompt unconditionally https://github.com/brotzeit/rustic/blob/master/rustic-compile.el#L409.

I'd like a way to default to "yes" here. Note that emacs has an existing flag to control this exact behavior in compilation commands (compilation-always-kill - https://www.gnu.org/software/emacs/manual/html_node/emacs/Compilation.html), but rustic doesn't appear to respect it (I have it set to t, which I believe is a default setting in doom emacs).