Handle stale LabelIdentities created for empty Pod labels correctly after upgrade #5449
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This is a follow-up on PR #5404 which intends to address issue #5403.
In upgrade cases, Antrea controller will still receive LabelIdentity add events for LabelIdentities created by previous controller, which it needs to handle correctly. Also, the stale controller logic needs to be updated to ensure that LabelIdentities created with old normalization method are cleaned up after upgrade.