Update ASSISTED_OPERATOR_INDEX to point to an updated index

[javipolo]

The current default index for assisted-operator is too old and not updated anymore, so we should use a different one

[openshift-ci]

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[openshift-ci]

Hi @javipolo. Thanks for your PR.

I'm waiting for a openshift-metal3 member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[mkowalski]

Duplicate of #1364

[javipolo]

Duplicate of #1364