Handle label fallback for dropdownMenu

[im3dabasia]

Closes: #70949

What?

Omitted label prop from the dropdownMenuProps used inside ToolsPanelHeaderProps

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Co-authored-by: mirka <0mirka00@git.wordpress.org>
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[t-hamano]

@im3dabasia Thanks for the PR!

Can you update this PR according to this comment?

[t-hamano]

I think this format is correct, but I don't know how to describe it in the README 😅

gutenberg/packages/components/src/tools-panel/tools-panel-header/README.md

Line 25 in 53b643c

- Type: `DropdownMenuProps`

cc @WordPress/gutenberg-components

Additionally, I think we need to update here as well:

gutenberg/packages/components/src/tools-panel/types.ts

Line 23 in 53b643c

dropdownMenuProps?: React.ComponentProps< typeof DropdownMenu >;

[mirka]

I don't know how to describe it in the README 😅

Mm, I'm fine with this for now, it's not crucial information. And we won't have to think about this once these are converted to an autogenerated readme!

[mirka]

I guess this is good to go? Sorry for the delay!