registry/txt: Drop old record format on reconcile

[k0da]

Description This PR lets controller to drop registry record in old format. This allows us to add TXT record support in the future, so managed record and registry record won't conflict in name and type.

Checklist

• [x] Unit tests updated
• [x] End user documentation updated

[k0da]

/assign @Raffo

[k0da]

@Raffo this one needs to go in after new release.

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/lifecycle rotten

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/close

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@k8s-triage-robot: Closed this PR.

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/close

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