tests/qtest: Bump timeouts of boot_sector_test()-based tests to 610 seconds

tests/qtest: Bump timeouts of boot_sector_test()-based tests to 610 seconds

We're still seeing timeouts in qtests that use a TCG payload with TCI
on a slow k8s runner:

 https://gitlab.com/qemu-project/qemu/-/jobs/5990992722

So we should bump the timeout of cdrom-test to see whether that
fixes the issue.
Now, cdrom-test, as bios-tables-test, pxe-test and vmgenid-test use
the boot_sector_test() function for running a TCG payload. That
function already uses an internal timeout of 600 seconds with
the remark that the test could be slow with TCI.
Thus from the outer meson test runner side, we should not use less
than 600 seconds as timeout values for these tests. Let's bump them
on the meson side to 610 seconds so that the tests themselves can
run with their internal 600 seconds timeout and have some additional
seconds on top for reporting the outcome.

Message-ID: <20240124084412.465638-1-thuth@redhat.com>
Reviewed-by: "Daniel P. Berrangé" <berrange@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>