schedule-builder: don't skip adding to EOL if next release is not set

[azlkiniue]

What type of PR is this?

/kind bug

What this PR does / why we need it:

If the next release is not available, look for the latest previous patch available. Only skip if both are not available. The previous skip that was added to prevent a panic when the next release is not set still occurs after the EOL check. Also change EOL date value to use EndOfLifeDate instead of TargetDate.

Which issue(s) this PR fixes:

Fixes #4450

Special notes for your reviewer:

None

Does this PR introduce a user-facing change?

Fixed `schedule-builder` skipping the addition of releases to `eol.yaml` when the `next` field is not set in `schedule.yaml`.

[kubernetes-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: azlkiniue
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[kubernetes-prow]

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[kubernetes-prow]

Hi @azlkiniue. Thanks for your PR.

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[cpanato]

/ok-to-test