Fix galera bootstrap deadlock when all pods are killed simultaneously

[lmiccini]

Three issues combined to delay galera cluster recovery by 12-54+ minutes when all pods were killed at once.

1. Status update race: injectGcommURI() stored gcomm state in Status.Attributes. The deferred PatchInstance (JSON merge patch) wrote this back, overwriting pod-pushed attributes (including ContainerIDs) with stale data from the start of the reconcile.

   Fix: move gcomm injection tracking to an in-memory map (gcommState) on the reconciler. The operator no longer modifies Status.Attributes, so pod-pushed data is preserved.

2. Unnecessary ContainerID check in findBestCandidate(): the function required all replicas to have attributes with ContainerIDs matching the currently running containers. But pods restart faster than the reconcile cycle, so CIDs never match. This check is unnecessary during bootstrap recovery because no pod has started mysqld (pods are blocked waiting for gcomm_uri), so the seqno on the persistent volume cannot change between container restarts.

   Fix: remove the CID comparison from findBestCandidate(). Only require that all replicas have pushed attributes with valid seqnos. Log CID mismatches for observability without blocking the decision.

3. Spurious joiner push: when all pods were killed, the StatefulSet's AvailableReplicas could remain > 0 briefly (stale status), causing Bootstrapped to be true. The operator pushed joiner gcomm URIs to pods, making them start mysqld against dead peers and wasting a restart cycle.

   Fix: skip joiner gcomm push when Bootstrapped is set but no pods are actually Ready.

Also add a periodic 10s requeue when not bootstrapped, ensuring the reconciler retries even when no external events trigger a reconcile.

Functions converted to GaleraReconciler methods:

• injectGcommURI: tracks injection in gcommState instead of attr.Gcomm
• isBootstrapInProgress: checks gcommState instead of attr.Gcomm
• getPodsWaitingForGcomm: checks gcommState instead of attr.Gcomm

Generated-By: claude-opus-4-6

Jira: https://redhat.atlassian.net/browse/OSPRH-32408

[openshift-ci]

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