Auto merge of #126111 - Zalathar:fulldeps-hotplug, r=jieyouxu

Port `tests/run-make-fulldeps/hotplug_codegen_backend` to ui-fulldeps

This is the last remaining run-make-fulldeps test, which means I actually had to leave behind a dummy README file to prevent compiletest from complaining about a missing directory.

(Removing the run-make-fulldeps suite entirely is non-trivial, so I intend to do so in a separate PR after this one.)

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I wasn't sure about adding a new kind of aux build just for this one test, so I also tried to just port this test from Makefile to [rmake](rust-lang/rust#121876) instead.

But I found that I couldn't get rmake to fully work for a run-make-fulldeps test, which convinced me that getting rid of run-make-fulldeps is worthwhile.

r? `@jieyouxu`

Author: bors