[material-ui][Autocomplete] Improve design when there's a start adornment for small autocomplete (@TahaRhidouani)

[github-actions]

Cherry-pick of #41781

[mui-bot]

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[DiegoAndai]

I'm not sure it was necessary to cherry-pick this 🤔 We should only cherry-pick urgent fixes.

Was there a particular reason to do it?

[ZeeshanTamboli]

I'm not sure it was necessary to cherry-pick this 🤔 We should only cherry-pick urgent fixes.

Was there a particular reason to do it?

The user is using Material UI version 5. I wasn't aware that only urgent fixes, like regressions, are allowed to be cherry-picked. I think we should continue to support fixes on v5 at least until v6 is close to a stable release (maybe by the end of the beta phase?). Developers won't be migrating so early in production applications. From my experience working on GitHub issues, I've seen developers still migrating from v4 to v5. What are your thoughts?

[DiegoAndai]

I think we should continue to support fixes on v5 at least until v6 is close to a stable release

Yeah, you're right. Let's go with that.