* OTLP receiver: Don't append _total suffix to non-monotonic OTel sums
Fix the OTLP receiver so the suffix _total isn't appended to metrics
converted from non-monotonic OTel sum metrics, if otlp.translation_strategy is
UnderscoreEscapingWithSuffixes or NoUTF8EscapingWithSuffixes.
Also add translation tests.
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Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>