bpf/selftests: disable get_branch_snapshot test
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2161527
Upstream status: RHEL-only
The test uses ballpark values that often are not met. I also confirmed that upstream kernels fail the same way on hardwere where we observed failures with rhel kernels.
Signed-off-by: Artem Savkov asavkov@redhat.com