fix: "edit add labels" make labels handle -f flag same as commonLabels

[fktym]

kustomize edit add labels command modifies labels to handle the -f flag the same way as commonLabels. This change should also address one of the concerns raised in #4746 (comment).

Current Behavior:

• commonLabels: kustomize edit add labels name:value -f overwrites existing labels when using -f flag
• labels: kustomize edit add labels name:value -f --without-selector creates a new Labels entry even with -f flag

Fixed Behavior:

• labels: kustomize edit add labels name:value -f --without-selector overwrites existing labels when using -f flag

Note:

• When determining if labels are the same, we also check if the includeSelector and includeTemplates values match

This change unifies the -f flag behavior between commonLabels and labels. I needed this overwrite functionality as I use kustomize edit add labels in CI to update versions.

Related:
- #4746 (comment)
- #4486

[linux-foundation-easycla]

• ✅login: fktym / (c17d9c6)

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This pull-request has been approved by: fktym
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