[JENKINS-48405] Use NIO in tryOnceDeleteFile and makeWritable (#3169)
* Use NIO in tryOnceDeleteFile and makeWritable * Don't try to set PosixFileAttributes on Windows * Do not create arbitrary exceptions in makeWritable to fix test failures on Windows * Remove unhelpful layer of exception wrapping * Add test exercising Util#makeWritable in Util#tryOnceDeleteFile * Add test for deleting a non-existant file * Return early if changing permissions with NIO succeeds
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