[release/10.0.1xx][HotReload] Allow hot reload refresh script injection for 404 status code #51050
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Enable hot reload refresh script injection on 404 responses.
Description
Previously, after a 404 re-execution (e.g. via UseStatusCodePagesWithReExecute), hot reload actions stopped because the refresh script was not injected on the 404 response. Change permits injection for 404, adds a log when injection is skipped, and replaces the single 200-only test with positive/negative injection tests. Further refinement of the filtering logic may come later.
Fixes dotnet/aspnetcore#63831
Customer Impact
Developers hitting a 404 during development lost hot reload thereafter, forcing manual refresh/restarts and slowing inner-loop productivity.
Regression?
Risk
Justification: Narrow conditional change (adds 404), added tests, no behavioral impact outside dev hot reload script injection path.
Verification
Packaging changes reviewed?