Fix issue that wrong config panics http metricsets #6205
Merged
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When setting an invalide http config in a metricbeat module / metricset it could happen that the metricset paniced. The reason is that the error when unpacking the config was not properly returned and handled which lead to an empty http instance.
This PR changes the behaviour to return the errors which can then be handled by the metricsets. The issue also affects all metricsets which were based on the prometheus helper.
Closes #6192