fix: toString utils should unref the `Ref<T>`

[enpitsuLin]

fix #12884

What kind of change does this PR introduce? (check at least one)

• [x] Bugfix
• [ ] Feature
• [ ] Code style update
• [ ] Refactor
• [ ] Build-related changes
• [ ] Other, please describe:

Does this PR introduce a breaking change? (check one)

• [ ] Yes
• [x] No

If yes, please describe the impact and migration path for existing applications:

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• [ ] It's submitted to the main branch for v2.x (or to a previous version branch)
• [ ] When resolving a specific issue, it's referenced in the PR's title (e.g. fix #xxx[,#xxx], where "xxx" is the issue number)
• [ ] All tests are passing: https://github.com/vuejs/vue/blob/dev/.github/CONTRIBUTING.md#development-setup
• [ ] New/updated tests are included

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• [ ] A convincing reason for adding this feature (to avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it)

Other information:

[enpitsuLin]

Vue3 has a replacer parameter in JSON.stringify that call in toDisplayString but as same purpose toString doesn't

I'm not sure if I need to add that parameter or just do unref for Ref<T>

[LingRen]

don't depend v3, use type

[yyx990803]

• It should use replacer, otherwise it won't unwrap nested refs.
• It should not depend on v3, as it causes a circular dependency and causes runtime errors in the built version of Vue. See ae3e4b1c