Overwrite the subdataframes made with a for loop

General Usage Performance
5

Update, the version with combine actually is faster. We were just working with a very small data frame. See below

actually_large_df = DataFrame(ID = rand(large_df.ID, 100_000), Count = rand(large_df.Count, 100_000));

@btime analysis_ID_better(actually_large_df);
  2.476 ms (258 allocations: 2.54 MiB)

@btime analysis_ID(actually_large_df);
  10.774 ms (136 allocations: 919.75 KiB)
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