fix(components): [select & select-v2] remove-tag when use backspace

[Liao-js]

fix https://github.com/element-plus/element-plus/issues/16831

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🧪 Playground Preview: https://element-plus.run/?pr=16832 Please comment the example via this playground if needed.

[btea]

After merging this PR, #16840 can be merged synchronously.