[v0.21.0] fix: network event context #4029
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Commit f806cb4 changed context initialization to occur in the submit stage. However, network events do not have access to that context during their submit stage (since they happen in a cgroup_skb program). Therefore, add a call to init_task_context in the pre cgroup bpf program (cgroup_bpf_run_filter_skb). In addition add a validation in the e2e tests so that task context initialization in network events doesn't break. commit: cf391b4 (main), cherry-pick
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Backport of #4027