Pass tracked-shards to localnet in pytest correctly

[Longarithm]

#8187 introduces tracked-shards for localnet and makes it "all" by default. However, pytest also uses localnet option, and in most of places it assumes that tracked-shards is "none". In some test, it even overrides tracked shards in client_config_changes.

It breaks at least one test (repro_2916.py) - we can't tell more because nayduck is broken. We need to find a way to pass this argument to pytest correctly. cc @wacban