[QA] Refactor steps and functions

[swoichha]

Description

After https://github.com/owncloud/client/pull/8814/files has been merged now we have a method called waitForFolderToBeSynced. So, now we can refactor steps using

    waitFor(
        lambda: isFolderSynced(context.userData['clientSyncPath']),
        context.userData['clientSyncTimeout'] * 1000,
    )

and use the newly added method.

Also, refactor Given steps that has on the server in them and change them and add on the server at the end of the step.

[swoichha]

#8845 has been merged so closing this issue now.