api: revert breaking change in proto #2332
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Commit b6d3583 introduced a breaking change in our protobuf API by renaming the existing stack_trace field in the kprobe message to kernel_stack_trace when introducing user stack traces. While a change of this nature is not ordinarily problematic in protocol buffer APIs, it is an issue for Tetragon specifically since we rely on protojson for event exports. This effectively means that renaming a field breaks compatibility for downstream consumers of event exports. Revert the rename to prevent breakages.