ColorPalette components: Changed Props from __experimentalIsRenderedInSidebar to isRenderedLeftStart

[shimotmk]

What?

I will correct it according to the comment in the PR below.
#69169 (comment)

Changed Props from __experimentalIsRenderedInSidebar to isRenderedLeftStart

Why?

__experimentalIsRenderedInSidebar is not a good prop name, so change it to isRenderedLeftStart.

The names of the props are based on the placement.

gutenberg/packages/components/src/color-palette/index.tsx

Lines 149 to 161 in 4e3b759

	...( isRenderedInSidebar
	? {
	// When in the sidebar: open to the left (stacking),
	// leaving the same gap as the parent popover.
	placement: 'left-start',
	offset: 34,
	}
	: {
	// Default behavior: open below the anchor
	placement: 'bottom',
	offset: 8,
	} ),
	...receivedPopoverProps,

I will migrate __experimentalIsRenderedInSidebar to isRenderedLeftStart for components other than packages/format-library/src/text-color/inline.js in a separate branch.

How?

Testing Instructions

1. Open a post or page.
2. Insert a Paragraph block.
3. Inline text color selection works as before.
4. Sidebar colors also work as before, and you'll get a deprecation warning in the console.

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Co-authored-by: shimotmk <[email protected]>
Co-authored-by: mirka <[email protected]>

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[mirka]

Sorry for being unclear here, the problem is not really just about naming, but about allowing customization in a more generic way. So the general idea is for the component to simply accept popover props that will be passed down to the internal popover, rather than having a boolean prop that makes it open in a certain arbitrary placement.

There is a whole group of components that have this problem, so it may be good to first work out an overall strategy in #65581 (cc @WordPress/gutenberg-components).