Refactor WebUI tests

A bunch of tests for creation/deletion apps from app-incubator
were remowed because every changes in ui forms in app-incubator
leads to failure in murano-ci jobs. To avoid this intersection with
changes in other repository these tests were removed. Lately will
be created test application which will be used in such tests.

Implement: blueprint refactor-ui-tests
Change-Id: I62ca73c3473116ca1e01d7b69bed15f953c4f117
Merge "Refactor WebUI tests"