doc/usecase: adapt to bumped dpdk and vpp versions

- Update DPDK version from v22.11 to v23.07 in doc reference links.
- Update VPP version from v23.02 to v23.10 in doc reference links.
- Remove two VPP patches included in VPP v23.10.
- Update two VPP patches for VPP v23.10.
- Update L2 switching user guide and scripts to use separate runtime
  directories for VPP switch and traffic generator. This is needed by
  VPP v23.10.

Signed-off-by: Liangxing Wang <liangxing.wang@arm.com>
Reviewed-by: Nathan Brown <nathan.brown@arm.com>
Change-Id: I3e9093a8c307b05a076ca393010da2a48724410f