Remove send_default_pii from spark

[sentrivana]

See parent issue. Even if the integration itself doesn't branch based on send_default_pii, its tests still need adapting.

[linear-code]

PY-2874

[mn3mnn]

Hi @sentrivana
I’d like to work on this issue. If it’s available, could you assign it to me?
I’ll follow the migration approach described in the parent issue