test: Added custom project location to integrationUITest gradle task

[martinszuc]

What is the purpose of this change? What does it change?

In common-ui-test-library there is an issue with feature to specify UI test project location created by test instance of intellij.

These changes add a property to integrationUITest gradle task and use it to change location in Jenkinsfile for the UI tests.

e.g. sh "./gradlew integrationUITest -PtestProjectLocation=${env.HOME}/IdeaProjects/intellij-ui-test-projects/"

Was the change discussed in an issue?

This PR is a part of https://github.com/redhat-developer/intellij-common-ui-test-library/issues/181

[sonarqubecloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

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[openshift-ci[bot]]

@martinszuc: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-4.11	60acdc18eaa031f9d2795fc770a8497ab837d5ba	link	true	/test e2e-4.11
ci/prow/e2e-openshift	60acdc18eaa031f9d2795fc770a8497ab837d5ba	link	true	/test e2e-openshift

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[openshift-merge-robot]

PR needs rebase.

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[sbouchet]

@martinszuc @lgrossma : can you review this one ? is it still releveant ?