[rush] Fix(#5552): sort additionalFilesForOperation for hashing

[ericprestemon]

Summary

Fixes #5552: sort additionalFilesForOperation to produce a stable hash for caching

WIthout this, repeated runs of rush commands that had multiple "additional files" dependencies would randomly miss cache.

This stabilizes the cache key so it always hits when it should.

Details

I considered trying to get the ordering correct in ProjectChangeAnalyzer.ts and there was some discussion in the ticket (#5552) and @dmichon-msft suggested doing it InputsSnapshot.ts was the right place. It appears to be the simplest.

How it was tested

Impacted documentation

[ericprestemon]

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