fileapi: Compute codemodel compile groups before converting to Json

Previously we converted the description of each source file into its
compile group Json object and then used the Json object itself as a
unique identifier for the group.  When source files have large
descriptions their Json objects make inefficient map keys requiring deep
comparison operations.  Instead use our internal `CompileData` structure
as a map key.  This enables use of a hash map.

Issue: #19520

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