Gather hidden files and fix rake task

fixes https://gitlab.ruhr-uni-bochum.de/FDM/rdm-system/antleaf-projectmanagement/-/issues/454#note_228494 and https://gitlab.ruhr-uni-bochum.de/FDM/rdm-system/antleaf-projectmanagement/-/issues/399#note_228617

hyrax/app/services/verify_crc_dataset_import.rb

 require 'json'
 require 'csv'
+require 'find'
 
 class VerifyCRCDatasetImport
   extend ComplexHelper
@@ -126,7 +127,7 @@ class VerifyCRCDatasetImport
 
     # -- Get list of files from import directory including hidden files
     input_list = []
-    Find.find(import_path) do |fp|
+    ::Find.find(import_path) do |fp|
       unless FileTest.directory?(fp)
         unless self.restricted_file_names?(fp.split('/')[-1])
           input_list << fp.sub(import_path, '')