More e2e playwright tests

[rubenfiszel]

A few scenarios to cover

• Add a variable + edit it + delete
• Add a resource type + create a resource of that resource + edit it + delete resource + delete resource type
• Write a new script + preview it + save it + run it + edit it + run it
• Write a new Push flow + preview it + save it + run it + edit it + run it
• Write a new Pull flow with a schedule + preview it + run it + edit it + run it
• New schedule + run it + edit it + run it