Before deleting, check if there are other configurations using the same backend. If there are, do not proceed with the deletion#375

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wujiuye wants to merge 1 commit intokubevela:masterfrom wujiuye:feat-check-backend-ref

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Commits on Aug 22, 2023

Before deleting, check if there are other configurations using the same backend. If there are, do not proceed with the deletion (kubevela#374 )
吴就业
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