[no ticket][risk=no] Update e2e readme with test users information (#5178)
[no ticket][risk=no] Update e2e readme with test users information (#5178)

* [no ticket] update e2e README with test user info

* doc link

* fix indentation

* remove old lines

* PR feedback
all-of-us/workbench,all-of-us/workbench,all-of-us/workbench,all-of-us/workbench,all-of-us/workbench,all-of-us/workbench,all-of-us/workbench,all-of-us/workbench,all-of-us/workbench