🌱 patchHelper: call toUnstructured only if necessary

[sbueringer]

Signed-off-by: Stefan Büringer buringerst@vmware.com

What this PR does / why we need it:
Not every time when patch.NewHelper is called we also call Patch. This change avoids memory allocations in these cases by moving the toUnstructured call to the Patch func.

Kudos to @fabriziopandini for the idea & implementation

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

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[sbueringer]

/cherry-pick release-1.9

[k8s-infra-cherrypick-robot]

@sbueringer: once the present PR merges, I will cherry-pick it on top of release-1.9 in a new PR and assign it to you.

In response to this:

/cherry-pick release-1.9

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