[lib] extract local id field before sending report

Summary:
This field is needed only on client, also by this we're making sure that request validation on server will not fail.

Depends on D7909

Test Plan: Attach id field to report and try sending this and see if it's properly validated on keyserver.

Reviewers: tomek, michal

Reviewed By: tomek

Subscribers: ashoat, atul

Differential Revision: https://phab.comm.dev/D7910