feat: warn when an addon uses the legacy META-INF/resources/frontend layout (#24655) (CP: 25.2)#24802
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…layout (#24655) TaskCopyFrontendFiles still scans META-INF/resources/frontend/ for backwards compatibility, but that location is deprecated. Emit a once-per-jar/dir warning recommending the split layout: bundle sources for @JsModule/@CssImport under META-INF/frontend/, and runtime resources for @StyleSheet/@javascript under META-INF/resources/ (served directly by the servlet container).
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This PR cherry-picks changes from the original PR #24655 to branch 25.2.
Original PR description