feat: Change default gitops sub namespace

[darkdoc]

The new recommended namespace for the subscription is
openshift-gitops-operator.

[openshift-ci]

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[openshift-ci]

@darkdoc: 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/self-test	5621ccb	link	true	/test self-test

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