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 <pierre.krieger1708@gmail.com>

* Update client/telemetry/src/lib.rs

* Update client/telemetry/src/lib.rs

Co-authored-by: André Silva <123550+andresilva@users.noreply.github.com>

Co-authored-by: Pierre Krieger <pierre.krieger1708@gmail.com>
Co-authored-by: André Silva <123550+andresilva@users.noreply.github.com>