Replace existing import/export in the UI with the new pkg template format

[russorat]

we need to stop exporting the existing legacy template format and start using the updated CRD template format.
We also need to update all our existing system templates to use the new format.

[russorat]

This is still an issue when you export a dashboard and a task in the UI. We should convert those formats into the same ones used by InfluxDB Templates.

[jzahnd]

Closing due to age