fix(react): fix extracCss option for webpack 5

[jaysoo]

This PR fixes a configuration issue with CSS extraction. There shouldn't be a split chunks configuration since we want to keep it all in one file.

Current Behavior

When using webpack 5 and the CSS gets too large it'll split into multiple chunks, and the generated index.html is missing styling.

Expected Behavior

Everything should work the same as before in webpack 4.

Related Issue(s)

Fixes #6819, #6664, #6558, #6816

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	nx affected --target=e2e --base=06dc66b7702c6b7e5c26b0b999c63f6712f1a0b7
	nx affected --target=lint --base=06dc66b7702c6b7e5c26b0b999c63f6712f1a0b7 --parallel --max-parallel=4
	nx affected --target=test --base=06dc66b7702c6b7e5c26b0b999c63f6712f1a0b7 --parallel --max-parallel=2
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	nx build typedoc-theme

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[jaysoo]

Had to move it here since later versions of webpack 5 doesn't have these modules anymore, causing the build to break.

[markogresak]

@jaysoo I have tested this change via the @next release (version 12.9.0-rc.0) and it does fix #6819, but not #6816 (css minification).

stylesOptimization is ignored with isWebpack5. I think we need the changes from #6817 or something similar.

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