Upgrade OpenShift to 4.8 and go to 1.15

[sleshchenko]

No description provided.

[openshift-ci]

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

Test name	Commit	Details	Rerun command
ci/rehearse/devfile/devworkspace-operator/main/v8-devworkspace-happy-path	c56fc0b	link	/test pj-rehearse
ci/prow/pj-rehearse	c56fc0b	link	/test pj-rehearse

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JPinkney, sleshchenko

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Needs approval from an approver in each of these files:

• ci-operator/config/devfile/devworkspace-operator/OWNERS [JPinkney,sleshchenko]
• ci-operator/jobs/devfile/devworkspace-operator/OWNERS [JPinkney,sleshchenko]

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[openshift-ci]

@sleshchenko: Updated the following 2 configmaps:

• ci-operator-master-configs configmap in namespace ci at cluster app.ci using the following files:
  • key devfile-devworkspace-operator-main__v7.yaml using file ``
  • key devfile-devworkspace-operator-main__v8.yaml using file ci-operator/config/devfile/devworkspace-operator/devfile-devworkspace-operator-main__v8.yaml
• job-config-master configmap in namespace ci at cluster app.ci using the following files:
  • key devfile-devworkspace-operator-main-presubmits.yaml using file ci-operator/jobs/devfile/devworkspace-operator/devfile-devworkspace-operator-main-presubmits.yaml

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