Sort expansions of aggregating middlemen by exec file path. These commonly

contain a large set of files required for a particular toolchain that are added
to every single compile action. Some exeutors in turn sort all action inputs in
order to properly cache, deduplicate and serialize them.

Sorting the expansion of these middlemen needs to be done only once and a later
sorting together with a bunch of other action input files is much faster (as
Java's TimSort algorithm is effectively linear with mostly sorted inputs).

RELNOTES: None.
PiperOrigin-RevId: 204285426

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