misc: Removing default value of idleReplicaCount

[YashasviDevtron]

Description

Fixes https://github.com/devtron-labs/devtron/issues/6729

Checklist:

• [ ] The title of the PR states what changed and the related issues number (used for the release note).
• [ ] Does this PR requires documentation updates?
• [ ] I've updated documentation as required by this PR.
• [ ] I have performed a self-review of my own code.
• [ ] I have commented my code, particularly in hard-to-understand areas.
• [ ] I have tested it for all user roles.
• [ ] I have added all the required unit/api test cases.

Does this PR introduce a user-facing change?

Summary by Bito

The pull request updates helm chart values files by removing default idleReplicaCount settings and adjusting related parameters in both deployment and reference charts. The changes aim to streamline configurations to prevent potential misconfigurations during deployments while enhancing consistency and reliability.