The telemetry should not be initialized if no telemetry has been provided (#6666)

* Initial commit

Forked at: e10598af


Parent branch: origin/master

* Fix: do not initialize telemetry if telemetry is not set

* Update client/telemetry/src/lib.rs

Co-authored-by: Pierre Krieger <[email protected]>

* Update client/telemetry/src/lib.rs

* Update client/telemetry/src/lib.rs

Co-authored-by: André Silva <[email protected]>

Co-authored-by: Pierre Krieger <[email protected]>
Co-authored-by: André Silva <[email protected]>