feat(symfony-filesystem): finish the Filesystem port and trim its API

doRemove() renames a directory to a random hidden name before emptying
it, and undoes that rename when the final rmdir fails, so a concurrent
process cannot recreate the path mid-removal. It also walks one level at
a time through FilesystemIterator instead of flattening the whole tree,
and lets an inner rmdir failure pass, both as upstream does.

copy() keeps the mode fopen($targetFile, 'w') would have left rather
than the origin's, symlink() and mirror() call readlink() and
getLinkTarget() where upstream does, and a directory iterator that
cannot be opened propagates its UnexpectedValueException instead of
being swallowed or flattened into an IOException.

Error message text is out of scope per docs/known-incompatibilities.md,
so the three TODO(phase-c) markers that only tracked wording are gone,
along with linkException()'s Windows-only branch. So are the arguments
no caller varies -- symlink()'s copyOnWindows, mirror()'s iterator and
options, copy()'s overwriteNewerFiles -- which removes the last
TODO(phase-c) in the file.

New shim functions: readlink, filesystem_iterator, stream_is_local,
strrev and SplFileInfo::getLinkTarget. base64_encode takes bytes so
random_bytes() can feed it.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

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