bpf: Report Execution Context Safety errors

Augment selected sleepability and critical-section failures with Execution
Context Safety reports. Keep the existing verifier messages and add source
context, path history, and suggestions tied to the active context.

Use the context history recorded earlier to anchor causal paths to lock, IRQ,
RCU, and preempt regions instead of unrelated register updates.

Cover global calls while holding a lock, sleepable global function calls,
sleepable helpers, sleepable kfunc calls from disallowed contexts, operations
that exit while a context is still active, and unmatched context exits.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://patch.msgid.link/20260815064612.378577-13-memxor@gmail.com
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>

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