OpenShift CI: Download latest odo rather than building from main

[johnmcollier]

What does this PR do?:

Updates the OpenShift CI script to download the latest odo from https://developers.redhat.com/content-gateway/rest/mirror/pub/openshift-v4/clients/odo/latest rather than building the latest odo from main

Makes the script consistent with our github action (at least once devfile/api#771 is fixed)

Which issue(s) this PR fixes:

N/A

[elsony]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: elsony, johnmcollier, kim-tsao

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[openshift-ci]

New changes are detected. LGTM label has been removed.

[openshift-ci]

@johnmcollier: The following test 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/v4.7-registry-test	bdc9129	link	true	/test v4.7-registry-test

Full PR test history. Your PR dashboard.

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[johnmcollier]

Looks like a CI flake… merging