Add initial tests for the ext4l filesystem driver:
- fs_test_ext4l_probe_norun: verifies the driver can probe and mount
an ext4 filesystem
- fs_test_ext4l_msgs_norun: verifies the ext4l_msgs env var causes
mount messages to be printed
The C tests use UTF_MANUAL flag and accept fs_image argument,
following the pattern established by fs_basic.c. The Python wrapper
creates an ext4 image and calls the C tests.
Co-developed-by: Claude <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
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