Some tests were using `self.filecheck` with `platform shell cat {log}`
to validate test behavior through log inspection.
This doesn't work when running the testsuite against a remote platform
since the logs are saved on the host's filesystem.
This patch refactors those call sites to use the new `filecheck_log`
helper, which ensures the log file is always read from the host
platform.
Signed-off-by: Med Ismail Bennani <ismail@bennani.ma>
564f433083