[lib] Remove setCookieOnRequest

Summary:
ENG-4747
Depends on D9290

After D9288 both web and native had this config set to true so we can remove it and simplify the code.

Test Plan: yarn flow-all

Reviewers: inka, kamil, atul, ashoat

Reviewed By: atul, ashoat

Subscribers: ashoat, tomek, wyilio

Differential Revision: https://phab.comm.dev/D9502