filesystem: Avoid unwanted indirections...

...that std::filesystem::* calls produce. This is because existence
and type checks use almost exclusively std::filesystem::status,
which follows symbolic links, when being called with path arguments.
Instead, one should instead use these methods with the value
returned by a call of std::filesystem::symlink_status.

This commit also streamlines the FileSystemManager tests, as well
as replace bare calls to std::filesystem with their FileSystemManager
counterparts (where suitable).

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