* fix types in prepartion for test TS migration

extended_commands.d.ts
- add missing typedWithForce function definition

email.d.ts
- fix getRecentEmail param typedef

common.d.ts
- add missing uiGetButton param definition

sidebar_left.ts
- fix uiOpenTeamMenu item param optional

user.d.ts
- add missing apiAdminLoginWithMFA param definition
- made apiCreateUser options param optional
- made apiCreateGuestUser options param optional

ui_commands.ts
- change clickPostCommentIcon location param to optional

* add explicit createPrivateChannel export

due to module.exports being typed as any, resulting in
the error below.

Fixes Error Message in guest_add_spec.ts:
Module '"../elasticsearch_autocomplete/helpers"' has no exported member 'createPrivateChannel'.ts(2305)

* migrate /enterprise/guest_accounts tests to TS

Files moved to TS:
- guest_add_spec
- guest_experience_ui_spec
- guest_identification_spec
- guest_identification_ui_not_cloud_spec
- guest_identification_ui_spec
- guest_invitation_ui_more_spec
- guest_invitation_ui_spec
- guest_popover_ui_spec
- guest_removal_ui_spec
- member_invitation_ui_spec
- system_console_guest_access_ui_spec
- system_console_manage_guest_not_cloud_spec
- system_console_manage_guest_spec

* migrate guest_feature_spec to TS

Not too sure about putting an empty function there. Please provide
feedback on the best way to approach it.

* fix: broken types from merge

* refactor: convert helpers to TS

* refactor: add types to e2e test variables

* Fixed issues

Co-authored-by: David Taing <adavidtaing@gmail.com>