fix: taint optimistic locking

[jpschmitt02]

Description

Switch to optimistic lock when updating taints to avoid race conditions.

Related Issue

Fixes #179

Type of Change

/kind bug

Testing

Tested in dev cluster intermittently experiencing a race condition with Karpenter registration taint.

Checklist

• make test passes
• make lint passes

Does this PR introduce a user-facing change?

No.

NONE

Doc #(issue)

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: jpschmitt02
Once this PR has been reviewed and has the lgtm label, please assign sergeykanzhelev for approval. For more information see the Code Review Process.

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[linux-foundation-easycla]

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• ✅ login: jpschmitt02 / name: Justin (77ac597)

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @jpschmitt02. 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.

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[ajaysundark]

/ok-to-test

[ajaysundark]

/assign @ajaysundark

[jpschmitt02]

/test

[jpschmitt02]

/test all