qa/workunits/rados/test.sh: make --serial work with --timeout

qa/workunits/rados/test.sh: make --serial work with --timeout

- For --serial we use timeout function and --timeout
value to to reutrn exit 1 if test exceeds --timeout.
- Update documentation for command-line arguments
such that user understands the order of argument matters.
- Use test arrays for better organization of test definitions
- Add test type tracking to properly handle both rados
and neorados tests when falling back on XML
- Change timeout default value to 90 minutes

Fixes: https://tracker.ceph.com/issues/70772
Signed-off-by: Kamoltat Sirivadhna <ksirivad@redhat.com>