[exporter/prometheusremotewrite] Add endpoint
label to the remote write metrics
#38397
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Description
It is often useful to know which endpoints the metrics are referring to directly, whilst this is something that an operator can infer by looking at the configuration, it is often the case that there's no direct access to it.
In the documentation, I don't see the endpoint being considered a secret so I reckon this is safe to do.
Link to tracking issue
This technically a prequite for the work that I'm about to do as part of open-telemetry/opentelemetry-collector#12255 but is not directly related and can go individually.