[8.0](backport #30038) [Filebeat] Fix panic in decode_cef when recovering from invalid data #30043
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…30038) * Fix panic in decode_cef when recovering from invalid data When recovering from an invalid extension value the escape sequence state was not cleared. This caused the parser to attempt to unescape the next extension which resulted in invalid data or a panic. Fixes #30010 * Encapsulate non-ragel state Document and encapsulate the non-ragel state variables. ``` $ benchcmp before.txt after.txt benchmark old ns/op new ns/op delta BenchmarkEventUnpack-12 1991 1544 -22.45% benchmark old allocs new allocs delta BenchmarkEventUnpack-12 13 13 +0.00% benchmark old bytes new bytes delta BenchmarkEventUnpack-12 642 642 +0.00% ``` (cherry picked from commit 47b8d02)
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