Add disabled waitForPodsReady to configuration by default.

[PBundyra]

What would you like to be added:
I'd like to add waitForPodsReady to configuration by default, which is now commented out. It shouldn't have any impact though as it's disabled by default.

Why is this needed:
This will increase consistency in the defaults.go file.

Completion requirements:

This enhancement requires the following artifacts:

• Design doc
• API change
• Docs update

The artifacts should be linked in subsequent comments.

[kannon92]

/help
/good-first-issue

You want to add this as default with WaitForPodsReady disabled?

https://github.com/kubernetes-sigs/kueue/blob/main/config/components/manager/controller_manager_config.yaml#L26

Just uncomment WaitForPodsReady and disable it?

[k8s-ci-robot]

@kannon92:
This request has been marked as suitable for new contributors.

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In response to this:

/help
/good-first-issue

You want to add this as default with WaitForPodsReady disabled?

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