Download chectl install script from che-incubator.github.io in tests

[dmytro-ndp]

What does this PR do?

Fix URL where E2E tests is downloading chectl install script from.

Screenshot/screencast of this PR

What issues does this PR fix or reference?

eclipse-che/che#22925

How to test this PR?

PR Checklist

As the author of this Pull Request I made sure that:

• The Eclipse Contributor Agreement is valid
• Code produced is complete
• Code builds without errors
• Tests are covering the bugfix
• The repository devfile is up to date and works
• Sections What issues does this PR fix or reference and How to test this PR completed
• Relevant user documentation updated
• Relevant contributing documentation updated
• CI/CD changes implemented, documented and communicated

Reviewers

Reviewers, please comment how you tested the PR when approving it.

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: artaleks9, dmytro-ndp

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[openshift-ci]

@dmytro-ndp: 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/v14-github-no-pat-oauth-flow	a9d0537	link	true	/test v14-github-no-pat-oauth-flow
ci/prow/v14-github-no-pat-oauth-flow-raw-devfile-url	a9d0537	link	true	/test v14-github-no-pat-oauth-flow-raw-devfile-url
ci/prow/v14-che-smoke-test	a9d0537	link	true	/test v14-che-smoke-test
ci/prow/v14-gitlab-no-pat-oauth-flow	a9d0537	link	true	/test v14-gitlab-no-pat-oauth-flow
ci/prow/v14-azure-no-pat-oauth-flow	a9d0537	link	true	/test v14-azure-no-pat-oauth-flow
ci/prow/v14-bitbucket-no-pat-oauth-flow-ssh-url	a9d0537	link	true	/test v14-bitbucket-no-pat-oauth-flow-ssh-url
ci/prow/v14-github-with-pat-setup-flow	a9d0537	link	true	/test v14-github-with-pat-setup-flow
ci/prow/v14-gitea-with-pat-setup-flow	a9d0537	link	true	/test v14-gitea-with-pat-setup-flow
ci/prow/v14-bitbucket-no-pat-oauth-flow	a9d0537	link	true	/test v14-bitbucket-no-pat-oauth-flow
ci/prow/v14-gitlab-no-pat-oauth-flow-raw-devfile-url	a9d0537	link	true	/test v14-gitlab-no-pat-oauth-flow-raw-devfile-url
ci/prow/v14-azure-no-pat-oauth-flow-raw-devfile-url	a9d0537	link	true	/test v14-azure-no-pat-oauth-flow-raw-devfile-url
ci/prow/v14-gitlab-no-pat-oauth-flow-ssh-url	a9d0537	link	true	/test v14-gitlab-no-pat-oauth-flow-ssh-url
ci/prow/v14-gitea-no-pat-oauth-flow	a9d0537	link	true	/test v14-gitea-no-pat-oauth-flow
ci/prow/v14-bitbucket-no-pat-oauth-flow-raw-devfile-url	a9d0537	link	true	/test v14-bitbucket-no-pat-oauth-flow-raw-devfile-url
ci/prow/v14-gitlab-with-pat-setup-flow	a9d0537	link	true	/test v14-gitlab-with-pat-setup-flow
ci/prow/v14-gitlab-with-oauth-setup-flow	a9d0537	link	true	/test v14-gitlab-with-oauth-setup-flow
ci/prow/v14-github-no-pat-oauth-flow-ssh-url	a9d0537	link	true	/test v14-github-no-pat-oauth-flow-ssh-url
ci/prow/v14-azure-no-pat-oauth-flow-ssh-url	a9d0537	link	true	/test v14-azure-no-pat-oauth-flow-ssh-url
ci/prow/v14-azure-with-pat-setup-flow	a9d0537	link	true	/test v14-azure-with-pat-setup-flow

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[devstudio-release]

Build 3.14 :: server_3.x/335: Console, Changes, Git Data