Ensure polyfills exist after external @import at-rules
#17490
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This PR fixes an issue where external
@import url(…)at-rules were not at the top anymore due to the polyfills being pre-pended to the CSS output.To solve this, we will inject a
@layer __tw-properties;as a placeholder to at the top of the file. A body-less@layeris allowed to exist before any other rules in the file.Later we inject all the polyfills at the bottom of the file inside the
@layer __tw-polyfills;at-rule.