Always export Entity CustomDimension in Telemetry

[JulianSchmidtke]

When using Telemetry the Event ADLSE-017 - Starting the export for table Exports the Entity as a Custom Dimension.
The Events ADLSE-004 - Exporting with parameters, ADLSE-020 - Exported to deltas CDM folder, and so on do not export the entity at the moment.

It would be nice to always have the Entity Custom Dimension so we can find out how long the export for a given entity took.

Also the count of updated records would be interesting. That way we can calculate the mean duration for the export of a single dataset and can monitor the performance.