Cherry-pick #8751 to 6.x: Dissect tag on parsing error #8818
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Cherry-pick of PR #8751 to 6.x branch. Original message:
Before when a parsing error occurred the events was returned untouched
and an error was logged, if you don't look at your logs you have no
the idea that the tokenizer was not able to match your string.
Instead, when a parsing error occurs in the Dissect processor, we will now
add a tag named 'dissect_parsing_error' to the 'log.flags' field.
With that information, you are now able to reprocess your data or do
filtering on the UI.
Fixes: #8123