fix: add "imagePullPolicy: IfNotPresent" in helmchart's kube-scheduler image

[Gekko0114]

What type of PR is this?

/kind cleanup
/kind bug

What this PR does / why we need it:

With the addition of "imagePullPolicy: IfNotPresent", we can run helm as-a-second-scheduler more easily than before.

When attempting to run helm as-a-second-scheduler in my local environment, I wanted to use "localhost:5000/scheduler-plugins/kube-scheduler:latest" image. However, the deployment failed to pull the local image due to the absence of "imagePullPolicy: IfNotPresent".

It would also be consistent with the scheduler-plugins-controller for kube-scheduler to have "imagePullPolicy: IfNotPresent".

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Thank you for reviewing this PR.
Please let me know if I have made any mistakes or if there are any improvements that could be made.
Your comments and feedback are appreciated.

Does this PR introduce a user-facing change?

NONE

[k8s-ci-robot]

Hi @Gekko0114. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[Huang-Wei]

/ok-to-test

[Huang-Wei]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Gekko0114, Huang-Wei

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