Support index.php fallback for files in built-in server #12992
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If no router script is used, the built-in webserver will now look for a fallback index file recursively in all cases, including URLs with a period.
Furthermore, if a router script returns false, we will no longer perform a recursive fallback. Previously, recursive fallback was performed when the URL contained no period. The rationale for this is that it avoids serving the root index.php file when the router has indicated that the file is a static file.
The existing behavior essentially assumes that virtual routes don't contain periods, and that real files do. Both of those assumptions are incorrect.
Fixes GH-12604