SelectControl: Fix labelPosition

[ItsJonQ]

This update fixes the default labelPosition for the SelectControl (defaulting to top). The labelPosition component API is the same as that from InputControl.

README documentation has been updated for the various controls to indicate labelPosition.

Thanks to @jorgefilipecosta for spotting this one!

How has this been tested?

Tested locally in Storybook

• Run npm run storybook:dev
• Visit the SelectControl story (http://localhost:50240/?path=/story/components-selectcontrol--default)
• Change the labelPosition knob (below)
• Ensure the UI renders correctly

Checklist:

• [n/a] My code is tested.
• My code follows the WordPress code style.
• [n/a] My code follows the accessibility standards.
• [n/a] My code has proper inline documentation.
• I've included developer documentation if appropriate.
• [n/a] I've updated all React Native files affected by any refactorings/renamings in this PR.

[github-actions]

Size Change: +13 B (0%)

Total Size: 1.2 MB

Filename	Size	Change
build/components/index.js	202 kB	+13 B (0%)

ℹ️ View Unchanged

Filename	Size	Change
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build/annotations/index.js	3.67 kB	0 B
build/api-fetch/index.js	3.41 kB	0 B
build/autop/index.js	2.83 kB	0 B
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build/block-directory/style-rtl.css	943 B	0 B
build/block-directory/style.css	942 B	0 B
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build/editor/style-rtl.css	3.8 kB	0 B
build/editor/style.css	3.8 kB	0 B
build/element/index.js	4.64 kB	0 B
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build/format-library/style-rtl.css	547 B	0 B
build/format-library/style.css	548 B	0 B
build/hooks/index.js	2.13 kB	0 B
build/html-entities/index.js	621 B	0 B
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build/is-shallow-equal/index.js	711 B	0 B
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build/list-reusable-blocks/style-rtl.css	476 B	0 B
build/list-reusable-blocks/style.css	476 B	0 B
build/media-utils/index.js	5.32 kB	0 B
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build/nux/style.css	668 B	0 B
build/plugins/index.js	2.56 kB	0 B
build/primitives/index.js	1.41 kB	0 B
build/priority-queue/index.js	789 B	0 B
build/redux-routine/index.js	2.85 kB	0 B
build/rich-text/index.js	13.9 kB	0 B
build/server-side-render/index.js	2.77 kB	0 B
build/shortcode/index.js	1.69 kB	0 B
build/token-list/index.js	1.27 kB	0 B
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build/viewport/index.js	1.85 kB	0 B
build/warning/index.js	1.14 kB	0 B
build/wordcount/index.js	1.17 kB	0 B

_{compressed-size-action}

[ntsekouras]

Looks good @ItsJonQ 👍 ! Thanks!