Fix KongUpstreamPolicy to respect healchecks.thresholds

[elbrogan-vizio]

Which issue this PR fixes:

Fixes #7755

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[randmonkey]

It should be heatlthchecks.Threshold. Also, since the types are different in CRD and Kong SDK (*int64 and *flaot64), there should be a translateThreshold function to run the transferring like

func translateThreshold(threshold *int64) *float64 {
    if threshold == nil {
        return nil
    }
    return lo.ToPtr(float64(*threshold))
}

[randmonkey]

@elbrogan-vizio Thank you for contributing.
We are sorry that we are not able to let CIs pass on PRs submitted so they cannot be merged to main branch now. Would you mind me cherry-picking your commit into another branch and rework on the new branch, so your contribution can be merged?

[randmonkey]

@elbrogan-vizio Thank you for contributing.
We want to release a patch to fix the issue #7755 you have submitted.
Would you please update the PR according to my comments? If you do not have the time to update your PR before this Friday, we will do the fix in another PR with your commit cherry-picked to our PR.
Also, it requires you to sign the CLA to make your commit be able to merge. If you do not sign the CLA, your commit cannot be merged and we have to fix the issue WITHOUT your commit.

[elbrogan-vizio]

While I would like to have worked on this further, unfortunately my company's legal team has not signed off on the CLA.

[randmonkey]

While I would like to have worked on this further, unfortunately my company's legal team has not signed off on the CLA.

Thanks again for your concentration on the issue. From your reply, it shows that you cannot sign our CLA unless your company's legal team allow you to sign it, but they did not give a certain feedback on it. Is that the case you are facing?
We are also waiting for the input of legal team of our company if it is OK to merge our own fix without your commits and mention your contribution in our changelog and commit message. (we are sorry if we have to take this solution since it does not respect your ownership and contribution, but it could unblock the legal team of your company to allow you to sign the CLA)