Generate Index yaml entries for older channels correctly

[mgencur]

For older channels, we ignore micro-releases and only use the initial version from those streams because we don't know how many micro release will be in that stream in advance.

Related to https://github.com/openshift-knative/serverless-operator/pull/2575/files#r1537601825

Proposed Changes

[pierDipi]

/lgtm
/approve

/hold for tests

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mgencur, pierDipi

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[mgencur]

/retest-required

[openshift-ci]

@mgencur: 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/415-upstream-e2e-kafka-aws-415	5a5890c	link	false	/test 415-upstream-e2e-kafka-aws-415

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[ReToCode]

/test 412-test-upgrade-aws-412

[ReToCode]

/override "ci/prow/415-test-upgrade-aws-415"

[openshift-ci]

@ReToCode: Overrode contexts on behalf of ReToCode: ci/prow/415-test-upgrade-aws-415

In response to this:

/override "ci/prow/415-test-upgrade-aws-415"

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[pierDipi]

/unhold