happy path test against DWO should take into account manifests changing

[sleshchenko]

Is your task related to a problem? Please describe.

Currently, happy path test against DWO run just tests with chectl embedded deployment manifests, which:

• may not work due container needs updated manifests;
• may work but hide regression since CRD is used from master.

It's needed to prepare manifests folder chectl where the current PR deployment manifests will be present, like che operator happy path test already does eclipse-che/che-operator@3c1dafe

Note that some PRs like devfile/devworkspace-operator#391 also depend on DevWorkspace Che Operator, which means - we should build it for PR check as well, if https://github.com/che-incubator/devworkspace-che-operator has the same branch name.
Otherwise we won't have another option than just ignore happy path test in such cases, after manually testing.