[tests-only] add tests for guests with totp

[kiranparajuli589]

Description

Adds WebUI scenario for guest users with TOTP enabled and

• check shared resource existence
• uploading on a share
• downloading a share

Related

Fixes: https://github.com/owncloud/twofactor_totp/issues/248

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Signed-off-by: Kiran Parajuli kiranparajuli589@gmail.com

[ownclouders]

:boom: Acceptance tests pipeline webUITOTPGuests-master-chrome-mariadb10.2-php7.4 failed. The build has been cancelled.

https://drone.owncloud.com/owncloud/twofactor_totp/1921/21