influx_query_manager doesn't catch ApiException, so Influx error responses 500

[matthewelwell]

influx_query_manager catches urllib3.exceptions.HTTPError, which covers
connection failures but not error responses — influxdb_client.rest.ApiException
subclasses InfluxDBError. So a 400/401/429/5xx from Influx propagates and 500s
the caller instead of degrading to an empty result. write() on the same class
already catches both.

-        except HTTPError as e:
+        except (HTTPError, InfluxDBError) as e:
             capture_exception(e)
             return []

Found via the sales dashboard, where get_events_for_organisation 500s the
organisation page if Influx responds with an error. CI never hits it because
there is no Influx service, so every query fails at the socket and is swallowed.

[royalpinto007]

I'd like to work on this.

Plan: catch InfluxDBError alongside HTTPError so error responses degrade to empty results.

Please assign it to me.