Fix syslog parsing for health-check

[rranjan3]

Description

Attempting to read syslog from head can lead to OOMs in error scenarios. For example, when there is a nw outage, all ENA dump fair amount of logs & can lead to rapid increase in size of the syslog. When the health-check agent or the EN goes for a reboot at such a stage, upon restart the tail plugin attempts to read the whole syslog in one go & that can make it run out of memory as the service is configured to use upto 128M of memory only.

Fixes # 78877, emf-642

Any Newly Introduced Dependencies

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Checklist:

• I agree to use the APACHE-2.0 license for my code changes
• I have not introduced any 3rd party dependency changes
• I have performed a self-review of my code