WIP: Move test to cypress.io

This is mostly just a PoC to see if our CI infrastructure is able to run
cypress.io tests.

Changing language currently triggers a "500 Parse Error" in cypress,
which needs to be fixed in Cockpit.

test/check-application

@@ -1,51 +0,0 @@
-#!/usr/bin/python3
-# Run this with --help to see available options for tracing and debugging
-# See https://github.com/cockpit-project/cockpit/blob/master/test/common/testlib.py
-# "class Browser" and "class MachineCase" for the available API.
-
-import os
-import sys
-
-# import Cockpit's machinery for test VMs and its browser test API
-TEST_DIR = os.path.dirname(__file__)
-sys.path.append(os.path.join(TEST_DIR, "common"))
-sys.path.append(os.path.join(os.path.dirname(TEST_DIR), "bots/machine"))
-import testlib
-
-
-class TestApplication(testlib.MachineCase):
-    def testBasic(self):
-        b = self.browser
-        m = self.machine
-
-        self.login_and_go("/starter-kit")
-        # verify expected heading
-        b.wait_present(".container-fluid h2")
-        b.wait_text(".container-fluid h2", "Starter Kit")
-
-        # verify expected host name
-        hostname = m.execute("hostname").strip()
-        b.wait_present(".container-fluid p")
-        b.wait_text(".container-fluid p", "Running on " + hostname)
-
-        # change language to German
-        b.switch_to_top()
-        b.click("#content-user-name")
-        b.click(".display-language-menu a")
-        b.wait_popup('display-language')
-        b.set_val("#display-language select", "de-de")
-        b.click("#display-language-select-button")
-        b.expect_load()
-        # HACK: work around language switching in Chrome not working in current session (Cockpit issue #8160)
-        b.reload(ignore_cache=True)
-        b.wait_present("#content")
-        # menu label (from manifest) should be translated
-        b.wait_text("#host-apps a[href='/starter-kit']", "Bausatz")
-
-        b.go("/starter-kit")
-        b.enter_page("/starter-kit")
-        # page label (from js) should be translated
-        b.wait_in_text(".container-fluid p", "Läuft auf")
-
-if __name__ == '__main__':
-    testlib.test_main()