Modify get_file_in_data_folder to account for files within unzipped files

[jrlegrand]

Replace FDA UNII get_file_name function with standard get_files_in_data_folder + filter

          You can use the get_files_in_data_folder function already there to pull all of the downloaded data files. It returns a list so you can iterate through it here in the DAG to find the match

Originally posted by @lprzychodzien in #300 (comment)

[jrlegrand]

Note @lprzychodzien - this solution would probably not work without modifying the get_files_in_data_folder to account for zip files... which we can do. I just thought it was an easy fix and doesn't look that way.