moved Zk cleaner threads into utility class

[ArbaazKhan1]

closes issue #5041

Added support for alerting when the number of running Compactors or Scan Servers falls below the configured expected process counts.

Changes:

• Added ExpectedProcessCounts support to ServiceStatusReport.
• Parsed general.expected.process.counts once per alert cycle and skipped processing entirely when the property is not configured.
• Reused the existing Compactor and Scan Server state already collected during processResponse(), avoiding any additional ZooKeeper reads.
• Added a new alert that reports a high / resource alert whenever the running process count for a configured server group is less than its expected count.