fix: include label in templates when adding by cli

[kozjan]

Related to this comment: #1009 (comment)

added --include-templates to add labels to templates when using kustomize edit add label

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[stormqueen1990]

Hi there, @kozjan! 👋🏻

Thank you for your contribution!

This looks mostly good to me. However, this implementation requires --without-selector to be specified and there's no added validation for that. Could you please update validateAndParse to ensure that any invocation of kustomize edit add label --include-templates fails when --without-selector is not specified, as well as an extra test case for that scenario?

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