[Autocomplete][base-ui] Added ref to getInputProps return value

[DarhkVoyd]

• I have followed (at least) the PR section of the contributing guide.

The type of the UseAutocompleteReturnValue.getInputProps (in packages\mui-base\src\useAutocomplete\useAutocomplete.d.ts) needed to be extended and include the ref: React.Ref field.

Closes #36552

[mui-bot]

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[DarhkVoyd]

@michaldudak @sai6855 can you please help me out, why my 3 checks failed?

[michaldudak]

@DarhkVoyd The test_static fails because you did not run yarn docs:api. See the Contributing doc for required steps when submitting a PR.
As for the test_types, it seems that your change has already helped find issues in our demos :)
The docs\data\base\components\autocomplete\AutocompleteIntroduction\system\index.tsx and docs\data\base\components\autocomplete\AutocompleteIntroduction\tailwind\index.tsx incorrectly set their input refs (as getInputProps override whatever is set before). Since the demos work fine, it seems that setting the refs manually is not needed, so you can delete the offending lines.
Make sure to run yarn docs:typescript:formatted afterward.

[DarhkVoyd]

@michaldudak I have made necessary changes.

[michaldudak]

Looks good! It's a great first PR!

[DarhkVoyd]

@michaldudak can you please guide me what's next? I would like to do more, where can I start?

[michaldudak]

@DarhkVoyd feel free to browse the issues. We've got the good first issue and ready to take labels you can check out first.