Migrate etcd based idle checker to reconciler based idle checker

## Motivation

Migrate etcd based idle checker to reconciler based idle checker

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## Objective

[Clearly state the purpose or goal of this task.]

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## Details

[Outline the specific steps or changes needed to complete this task.]

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## Impact

[Describe how this task may indirectly influence other services, if at all.]

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JIRA Issue: BA-7383

The issue names no files, tests, or entry points. Start by locating the etcd-based idle checker and the reconciler-based idle checker, then determine the migration scope and affected behavior; done means the idle checker uses the reconciler approach instead of the etcd-based one.

Written by the indexing model from the issue text.