Remove a test blocking the update of the log crate

It tested #44953.
`log` macros in newer versions are no longer recursive, so these duplicated
error messages (about unstable feature uses) previously occurring at each
level of recursion are no longer possible, even with the fix by #45540.
Furthermore this test breaks when multiple versions of `log` are in the
sysroot (`log 0.3.9` depends on`log 0.4.1`)

Author: MaloJaffre