[sanitizer] Fix running sanitizer_bad_report_path_test on Linux as root (#97732)
Running tests as root is not the greatest idea, however, there is one
valid use case - running them in a container in order to verify LLVM on
different distros. There is no reason to configure unprivileged users
in a container, so one works as root.
sanitizer_bad_report_path_test assumes that creating a file in a
non-writable directory would fail, which is not the always case. For
example, when we are on Linux and CAP_DAC_OVERRIDE, which root has, is
in effect. Therefore, one solution is to drop it. However, that would
be Linux-specific.
Instead, use argv[0] as if it were a directory. mkdir() on top of a
file should be prohibited by all supported Posix operating systems.
Combine this with a partial revert of commit f4214e1469ad ("[sanitizer]
Skip test on Android where chmod is not working"), since we shouldn't
need to exclude Android anymore.
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