bazel syntax: avoid Printer.formattable in Mutability.create
Currently, Mutability.create uses Starlark formatting to produce
its internal name for debugging purposes, but typical callers
pass ("loading %s", PathFragment), and PathFragment is not a
legal Starlark value, and its use will soon be an error.
Now, Mutability simply joins an array using toString and spaces.
This change will enable us to break the lib.vfs -> lib.skylarkinterface dependency.
PiperOrigin-RevId: 277844415
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