fix: Lower Logback checkIncrement value

[labrenbe]

Description

Partially fixes stackabletech/issues#574.

By default Logback checks the size of log files every 60s to determine if log rotation should be triggered. This can be too slow in NiFi with high load resulting in log files becoming larger than the provisioned emptyDir volume. Lowering the checkIncrement property allows for more timely file size checks.

Definition of Done Checklist

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# Author
- [x] Changes are OpenShift compatible
- [x] CRD changes approved
- [x] Integration tests passed (for non trivial changes)

# Reviewer
- [x] Changelog updated

# Acceptance
- [ ] Feature Tracker has been updated
- [ ] Proper release label has been added

[siegfriedweber]

This change must be added to the changelog.

[siegfriedweber]

LGTM