remove velero addon and cold backup annotations

[bluzarraga]

What this PR does / why we need it:
Revert the changes to add the velero addon annotation and its required accompanying annotation k8s.enterprisedb.io/snapshotAllowColdBackupOnPrimary: enabled since we have never adopted its use in BR and it is causing problems with CPD BR process.

Originally, this was implemented because this addon method is what is officially supported by EDB and the CPD team is able to overwrite it with their own addon (external-backup-adapter). However, the k8s.enterprisedb.io/snapshotAllowColdBackupOnPrimary: enabled annotation is not overwritten and there is an edge case defined in the linked issue where this label is problematic. Since we do not use these sets of annotations, I believe it best to go ahead and remove them for the 4.10 release.

Which issue(s) this PR fixes:
Fixes # https://github.ibm.com/PrivateCloud-analytics/CPD-Quality/issues/31335

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