Remove tetragon_errors_total{type="handler_error"} metric

[lambdanis]

It was duplicating tetragon_handler_errors_total.

Part of #2785

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[olsajiri]

curious, can we still get the total number, like all the opcodes/err summed up?

[lambdanis]

curious, can we still get the total number, like all the opcodes/err summed up?

@olsajiri Yes, when querying metrics with PromQL you typically do something like

sum(rate(tetragon_bpf_missed_events_total[5m]))

In case of tetragon_errors_total metric however, such aggregation doesn't make much sense, because this metric is collecting various unrelated errors and non-errors. That's why I'm splitting it up, so that metrics queries are more meaningful.