Deleting the etcd-bootstrap configmap leads to etcd reconciliation to never succeed

[acumino]

How to categorize this issue?

/area control-plane
/kind bug

What happened:
If the stateful set is in errored state because of some wrong data in the etcd bootstrap configMap then fixing the etcd also doesn't lead to etcd reconciliation getting succeeded.
This is so because we expect sts to be ready in the preSync here which will not be ready because etcd bootstrap configMap will not get updated because configMap is updated in the syncEtcdResources which is after preSyncEtcdResources.
This lead to reconciliation getting stuck forever here.

Introduced in #777

What you expected to happen:

/cc @shafeeqes

Environment:

• Gardener version (if relevant):
• etcd-druid version:
• Kubernetes version (use kubectl version):
• Cloud provider or hardware configuration:
• Others:

[acumino]

/cc @unmarshall @shreyas-s-rao

[acumino]

/unassign