job-spec: Reduce qty of iterative tests for 2n-clx, 2n-icx, 2n-skx

Reason:
- ndrpdr job execution time >> 24hrs

Remove:
- ip4 and ip6 scale200k tests for dpdk and rdma
- ip4 and ip6 scale2m tests for dpdk and rdma
- af_xdp tests from NICs other than xxv710

Change-Id: I32fce8f436ae5ebbac8da9a9c670bdcb60abb3d8
Signed-off-by: Tibor Frank <tifrank@cisco.com>
(cherry picked from commit 9256923c6b890771ed17c53cd2896355e84987d0)