Improve kedro-telemetry logging

[antonymilne]

There's two problems with how kedro-telemetry does logging at the moment:

1. Sometimes it uses click.secho and sometimes it uses logging. This is inconsistent.
2. Due to changes in Improve logging setup in Kedro kedro#1461, as it stands, no kedro-telemetry logging message that is < WARNING will display now.

For point 1, technically speaking I think both these message should use logging.debug (not info) rather than click.echo. Since by default these messages should not show to a user (confirmed by @yetudada in sprint planning) then setting them to use logging.debug will make them disappear.

So all that should be needed here is modifying L64 and L57 to both use logging.debug, check that the messages disappear when you do kedro run, and update any tests affected.

Note, as per discussion in kedro-org/kedro#1546, at the moment there's no way for a user to change whether or not the kedro-telemetry messages are shown by altering project-side logging.yml because before_command_run hooks are run before that logging configuration is set up. This is fine for now.