Improve e2e tests (#8927)

* get e2e image picker working

* verify create account actually reaches onboarding

* wait for image to actually be attached before posting

* wait until login finishes before moving on

* sign out before switch accounts then wait until logged in

* disable onboarding experiments in e2e

* add testId to handle availability checkmark

* fix too long username

* update thread muting test to reflect current behaviour

* hackfix for the british english translation

* unflake the onboarding tests

* fix curate list flow

* admit defeat on the most list one

__e2e__/setupServer.js

@@ -1,8 +1,8 @@
-// eslint-disable-next-line
+// eslint-disable-next-line no-undef
 var res = http.post('http://localhost:1986/' + SERVER_PATH, {
   headers: {'Content-Type': 'text/plain'},
   body: '',
 })
 
-// eslint-disable-next-line
+// eslint-disable-next-line no-undef
 output.result = json(res.body).appviewDid