[receiver/influxdbreceiver] update receiver.go to add better log messages (#38357)

A simple change to propagate error messages for better debug logging
purposes.

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#### Description

This change looks to improve logging messages to help in debugging. 

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#### Link to tracking issue
Fixes bad logging...

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#### Testing
No tests needed. Just a single string update.

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#### Documentation

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---------

Co-authored-by: Antoine Toulme <[email protected]>
Co-authored-by: Antoine Toulme <[email protected]>

Author: wadawe

receiver/influxdbreceiver/receiver.go

@@ -184,7 +184,7 @@ func (r *metricsReceiver) handleWrite(w http.ResponseWriter, req *http.Request)
 		err = batch.AddPoint(string(measurement), tags, fields, ts, common.InfluxMetricValueTypeUntyped)
 		if err != nil {
 			w.WriteHeader(http.StatusBadRequest)
-			_, _ = fmt.Fprintf(w, "failed to append to the batch")
+			_, _ = fmt.Fprintf(w, "failed to append to the batch: %v", err)
 			return
 		}
 	}