fix(ClientApiGenFragmentTestv2.kt): fragment name projection

[coleturner]

This change fixes an issue where the codegen results in two Projection generated objects that share the name when used for union types as well as field projections.

Example schema:

type Query {
   videos: Video
   bestMovie: Movie
}

type Movie {
   title
}

type Show {
   title
}

union Video = Movie | Show

Because Movie is used both as a field and as a union type, when codegen generates projection objects for each, they will result in the same MovieProjection and only one file will be written to disk. What this change does is it renames the projection objects used in fragments, so that they can be written to disk separately.

[srinivasankavitha]

Looks great!