Create selenium tests for the walking skeleton flow

[garagatyi]

Description

We have 2 flows for the walking skeleton described in the epic. We have merged support of the walking skeleton in Che recently and want to be able to check it on CI.
These 2 tests would not be included in the default test suite but we should be able to run them separately.

If the description of the flow, tests cases, deployment of any other part is not clear, ping @garagatyi for details or help

Reproduction Steps

OS and version:

Diagnostics:

[garagatyi]

@l0rd how do you think which team Che QA and OSIO QE should work on that?

[l0rd]

@garagatyi Che QA team. We should be able to test master.

[l0rd]

The following 2 issues were created by QA team:

#11327
#11400

@vkuznyetsov @Ohrimenko1988 is the test you created for #11327 already included in the list of tests run every nightl?

[Ohrimenko1988]

@l0rd Test already in the scope and it runs on the openshift assembly every night. The name of the test is "TheiaBuildPluginTest". But it has a small problem which I plane fix tomorrow (StaleElementReferenceException). Besides, I almost finished the next test which covers the third step from "Ws.next Workshop" document (#11400). A small delay related to the routine of Che 6.12.0 release.

[l0rd]

Thank you for this update @Ohrimenko1988

[garagatyi]

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