fix: HasMany new items index after validation fails;#5819

alexoleynik0 wants to merge 3 commits intoz-song:masterz-song/laravel-admin:masterfrom

alexoleynik0:fix/5818-HasMany-field-new-index-key-in-js-resets-to-zeroalexoleynik0/laravel-admin:fix/5818-HasMany-field-new-index-key-in-js-resets-to-zeroCopy head branch name to clipboard