types(reactivity): Simplify the SymbolExtract

[Picknight]

No description provided.

[pikax]

Can you update the test "should keep symbols" on ref.spec.ts

  it('should keep symbols', () => {
    const customSymbol = Symbol()
    const obj = {
      [Symbol.asyncIterator]: { a: 1 },
      [Symbol.unscopables]: { b: '1' },
      [Symbol.match]: ref(1),
      [customSymbol]: { c: [1, 2, 3] }
    }

    const objRef = ref(obj)

    expect(objRef.value[Symbol.asyncIterator]).toBe(obj[Symbol.asyncIterator])
    expect(objRef.value[Symbol.unscopables]).toBe(obj[Symbol.unscopables])
    expect(objRef.value[Symbol.match]).toStrictEqual(ref(1))
    expect(objRef.value[customSymbol]).toStrictEqual(obj[customSymbol])
  })

Because without that test, all the tests pass even without the ExtractSymbol