Fix dropping analytics_repository_file_edits table

Check if `analytics_repository_file_edits` table exists before dropping
it.

db/migrate/20200123090839_remove_analytics_repository_table_fks_on_projects.rb

@@ -9,7 +9,7 @@ class RemoveAnalyticsRepositoryTableFksOnProjects < ActiveRecord::Migration[5.2]
     with_lock_retries do
       # Requires ExclusiveLock on all tables. analytics_* tables are empty
       remove_foreign_key :analytics_repository_files, :projects
-      remove_foreign_key :analytics_repository_file_edits, :projects
+      remove_foreign_key :analytics_repository_file_edits, :projects if table_exists?(:analytics_repository_file_edits) # this table might be already dropped on development environment
       remove_foreign_key :analytics_repository_file_commits, :projects
     end
   end

db/migrate/20200123091422_remove_analytics_repository_files_fk_on_other_analytics_tables.rb

@@ -8,7 +8,7 @@ class RemoveAnalyticsRepositoryFilesFkOnOtherAnalyticsTables < ActiveRecord::Mig
   def up
     with_lock_retries do
       # Requires ExclusiveLock on all tables. analytics_* tables are empty
-      remove_foreign_key :analytics_repository_file_edits, :analytics_repository_files
+      remove_foreign_key :analytics_repository_file_edits, :analytics_repository_files if table_exists?(:analytics_repository_file_edits) # this table might be already dropped on development environment
       remove_foreign_key :analytics_repository_file_commits, :analytics_repository_files
     end
   end

db/migrate/20200123091854_drop_analytics_repository_file_edits_table.rb

@@ -7,7 +7,7 @@ class DropAnalyticsRepositoryFileEditsTable < ActiveRecord::Migration[5.2]
 
   def up
     # Requires ExclusiveLock on the table. Not in use, no records, no FKs.
-    drop_table :analytics_repository_file_edits
+    drop_table :analytics_repository_file_edits if table_exists?(:analytics_repository_file_edits) # this table might be already dropped on development environment
   end
 
   def down