tests: nydus: Adapt "source ..." to GHA

The "source ..." we've been doing was not changed since those tests were
part of the Jenkins tests, and we need to adapt them, either setting the
correct path or entirely removing the ones that are not relevant to us
anymore.

Signed-off-by: Fabiano Fidêncio <fabiano.fidencio@intel.com>
(cherry picked from commit 4290fd4)

tests/integration/nydus/nydus_tests.sh

@@ -12,8 +12,7 @@ set -o pipefail
 set -o errtrace
 
 dir_path=$(dirname "$0")
-source "${dir_path}/../../lib/common.bash"
-source "${dir_path}/../../.ci/lib.sh"
+source "${dir_path}/../../common.bash"
 source "/etc/os-release" || source "/usr/lib/os-release"
 KATA_HYPERVISOR="${KATA_HYPERVISOR:-qemu}"