HDDS-14592. Reduce lock contention in AbstractLayoutVersionManager

[Russole]

What changes were proposed in this pull request?

• Remove explicit locking from AbstractLayoutVersionManager.
• Introduce immutable State with AtomicReference for lock-free state transitions.
• Convert feature maps read-only after initialization to prevent accidental changes and allow safe concurrent reads.
• Improve initialization validation and error handling (MLV > SLV case).
• Remove locking from finalized() and retain idempotent semantics.
• Fix OM initialization error handling to avoid accessing LayoutVersionManager state before it is initialized (MLV > SLV case).

What is the link to the Apache JIRA

https://issues.apache.org/jira/browse/HDDS-14592

How was this patch tested?

• All CI checks passed
  • https://github.com/Russole/ozone/actions/runs/22442711859

[Russole]

Hi @adoroszlai, @yandrey, @jojochuang,
Could you please take a look at this PR when you have time?
Thanks!