Spring Graceful fallback for non-default NIO.2 FileSystems

As a backport ticket from #35435, we can revise FileSystemUtils.copyRecursively toward tolerating different source/destination file systems, as well as leniently handling UnsupportedOperationException from File.toPath() in DataBufferUtils as well as ResourceHttpMessageWriter.

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Fixed via ba521643736d6d4d03a005550f3192fc0bf881bf