Add kernel configs necessary for enabling traffic control's (tc) NETEM

[ddelnano]

Summary: Add kernel configs necessary for enabling traffic control's (tc) NETEM

The goal with this change is to enable more advanced network shaping during BPF testing. For example, the recently added tcp stats source connector tracks tcp retransmissions, but we don't have a way to cause these retransmissions in order to verify that functionality works.

I'd like to use the tc-netem functionality to inject latency into a network interface that specific gtests can listen on (thinking link local interface that specific tests can opt themselves into). Configuring that interface and providing a nice c++ interface to it will come in later changes.

Busybox provides a tc utility, so I don't think any additional userspace tools are necessary. I will validate that the userspace component of this works once this kernel is available. If there are good ways to do this ahead of time, I'm happy to do that validation. It seems like I need to push a kernel to gcs or find a way for bazel to use a local kernel to do that.

Relevant Issues: N/A

Type of change: /kind test-infra

Test Plan: Verified the following the ensure the kernel config applied correctly

• Verified compiling our oldest and newest kernel results in net/sched/sch_netem.o built into the kernel

$ make -C tools/docker .build/kernel_build/linux-build-6.1.18.tar.gz 2>&1 | grep sch_netem
  CC      net/sched/sch_netem.o

$ make -C tools/docker .build/kernel_build/linux-build-4.14.254.tar.gz 2>&1 | grep sch_netem
  CC      net/sched/sch_netem.o

• Verified that within the docker image that the .config and .config.old file maintained the added kernel configs (P382)