[Refactor] move APIFormat() of Issue and Label to convert package (#10423)
* Label: delete .APIFormat() and use convert.ToLabel()
* move issue APIFormat too
* add missing one
* move TEST too
* handle error -> return empty APIIssue
* Apply suggestions from code review
Co-Authored-By: guillep2k <18600385+guillep2k@users.noreply.github.com>
Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: guillep2k <18600385+guillep2k@users.noreply.github.com>
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