Nebo15 / logger_json / 97f2ed5242e649143cb96f60468dde005906ab30

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fix(datadog): Encode metadata error value before embedding in error field (#174)

`format_error/4` embeds the raw metadata `:error` value into the log
line, bypassing `RedactorEncoder`. A non-JSON-encodable term (e.g. an
`{:error, reason}` tuple) then crashes the encoder.

This fix runs the value through `encode/2` (which also applies
redactors), matching how every other part of the line is built.

4 of 4 new or added lines in 1 file covered. (100.0%)

380 of 380 relevant lines covered (100.0%)

2510.19 hits per line