statsd: make TimedContextManagerDecorator report errors

using an incremented counter, instead of pushing an inacurrate timing data (if calling the encapsulated function raises an exception).

Depends on !52 (closed)

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Migrated from D1297 (view on Phabricator)

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No tests for the error behavior? Sad :(

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Add tests and follow vlorentz' advice

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mentioned in merge request swh/infra/ci-cd/swh-jenkins-jobs!23 (closed)

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closed