core(css-usage): prevent late stylesheet additions #15865
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Fixes CSS issue in #15864, still need to look into the JS files
If there is enough of a gap between the end of the page load and
CSSUsage.getArtifact, stylesheets that were added late in the page lifecycle can show up without a matching network request. This PR changes the behavior ofCSSUsageto stop collecting new stylesheets immediately once the navigation ends.