v1beta1 api: use stable channel for OLM bundle

[alebedev87]

stable-v1.0 channel is added as per the OLM naming convention. alpha channel is kept in order to make the CI pass, will have to be removed in another PR.

Follow-up of https://github.com/openshift/external-dns-operator/pull/141. Unblocks https://github.com/openshift/release/pull/28383.

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

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[alebedev87]

/retest

[alebedev87]

/retest

[alebedev87]

/retest

[alebedev87]

/retest

error creating EC2 NAT Gateway: InvalidElasticIpID.NotFound: The elasticIp ID 'eipalloc-0c269657ac123a6d6' does not exist

[openshift-ci[bot]]

@alebedev87: all tests passed!

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[arjunrn]

/lgtm

[alebedev87]

/label docs-approved /label qe-approved /label px-approved