Update tests for noteable_note.vue component

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The following discussion from !126359 (merged) should be addressed:

• @ekigbo started a discussion:

  nitpick: It'd be great to add some tests for the rendered output from these conditions, it doesnt like we currently have a lot of test coverage for this component.

  Additionally it looks like we have a FILE_DIFF_POSITION_TYPE constant already defined that we could re-use here.