Removed unnecessary user notifications for version conflict exception

[ask-kamal-nayan]

Description

The manual snapshot policy management system needs modification to prevent false alarm notifications caused by internal version conflict exceptions during concurrent snapshot operations.
GitHub Issue Reference
Current Behavior:

• Snapshot policy creates/deletes snapshots via cron jobs
• State updates are made to .ism-config system index
• Race conditions occur during concurrent operations which cause VersionConflictEngineException
• Manual snapshot happens as expected from users.
• Users receive notifications for all exceptions, including internal version conflicts
• False alarms are triggered for non-user-impacting issues

Proposed Changes:
Modify exception handling to suppress notifications for VersionConflictEngineException just log this as error message.
Maintain notifications for all other exception type

Related Issues

Check List

• New functionality includes testing.
• New functionality has been documented.
• API changes companion pull request created.
• Commits are signed per the DCO using --signoff.
• Public documentation issue/PR created.

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