bpf: Track verifier context diagnostic events

Record verifier context transitions in the diagnostic history so later reports
can anchor causal paths to the critical section that made an operation invalid.

This covers lock, IRQ, RCU, and preempt regions without adding any new
verifier error reports. Category-specific commits decide where those recorded
events should be rendered.

Use context depth when selecting scoped history so nested regions anchor at the
outer active region, and fall back to the earliest retained event when the
matching entry was pruned.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://patch.msgid.link/20260815064612.378577-8-memxor@gmail.com
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>

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