[material-ui][Snackbar] Remove notistack library

[ZeeshanTamboli]

Closes #42615

Originally, we added Material UI's Snackbar usage with notistack to show vertically stacked Snackbars. I was working on implementing this feature directly in Material UI (see PR #31991), but the PR was halted for various reasons.

Should we show usage with other libraries like react-toastify or sonner for vertically stacked snackbars?

Also, should this be cherry-picked to the master branch? I think it should.

[mui-bot]

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[danilo-leal]

Should we show usage with other libraries like react-toastify or sonner for vertically stacked snackbars?

Yeah, I think so! It'd make sense to replace notistack with something rather than just remove it (no hard preferences as far as making this right now in this PR or in a follow-up one). Generally speaking, we should still address the use case of vertically stacked snackbars somehow, with a recommendation of how we suggest pulling it off, while the component itself doesn't support it out of the box. I’m fine with both of these options.

[ZeeshanTamboli]

I agree to replace notistack, but it's not possible to use react-toastify or sonner with our Snackbar. I checked their documentation and tried with Material UI Snackbar. We documented notistack because it provided a design similar to Material UI's Snackbar. So, we shouldn't merge this PR until we find an alternative. Ideally, we should have our own solution in the library. Alternatively, we could suggest this solution with an embedded CodeSandbox in our docs.

[DiegoAndai]

Base UI will eventually work on their Toast component, which is planned for Q3 in the latest roadmap I could find.

What would you say is the urgency of this issue @ZeeshanTamboli? If it can wait until Q4, I think we can add it to the Base UI refactor milestone.

[ZeeshanTamboli]

I think we can add it to the Base UI refactor milestone.

I think you meant the Material UI refactor milestone, right? I'm fine with that. Ideally, before removing notistack, we should implement vertically stacked snackbars in our library. I'll close this PR and we'll continue recommending notistack for now, even if it's unmaintained, as it solves our issue.

[DiegoAndai]

I think you meant the Material UI refactor milestone, right?

This one: https://github.com/mui/material-ui/milestone/51

I'll add the issue to it