chore(all): delete useless Omit define (#4470)

components/_util/type.ts

@@ -1,6 +1,5 @@
 import type { App, PropType, VNodeChild, Plugin } from 'vue';
 
-export type Omit<T, K extends keyof T> = Pick<T, Exclude<keyof T, K>>;
 // https://stackoverflow.com/questions/46176165/ways-to-get-string-literal-type-of-array-values-without-enum-overhead
 export const tuple = <T extends string[]>(...args: T) => args;
 

components/breadcrumb/Breadcrumb.tsx

@@ -5,7 +5,7 @@ import { flattenChildren, getPropsSlot } from '../_util/props-util';
 import warning from '../_util/warning';
 import BreadcrumbItem from './BreadcrumbItem';
 import Menu from '../menu';
-import type { Omit, VueNode } from '../_util/type';
+import type { VueNode } from '../_util/type';
 import useConfigInject from '../_util/hooks/useConfigInject';
 
 export interface Route {