Add latest tag for s2i-lab-elyra JH image

[4n4nd]

This will add a latest tag for the s2i-lab-elyra image which will update regularly.

cc @ptitzler

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: 4n4nd
To complete the pull request process, please assign vpavlin after the PR has been reviewed.
You can assign the PR to them by writing /assign @vpavlin in a comment when ready.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[LaVLaS]

The latest tag should not be included in an ODH manifest.

When opendatahub-io/opendatahub-operator#123 is implemented, you can add the label opendatahub.io/modified: true to the elyra imagestream in your local deployment to prevent the operator from resetting this imagestreamtag

[openshift-ci]

@4n4nd: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
ci/prow/odh-manifests-e2e	fc27a00	link	/test odh-manifests-e2e

Full PR test history. Your PR dashboard.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.