[Housekeeping] Store the upload event as a datetime rather than a date (#269)

* [WIP] renamed and migrated upload_date column

* Refactored yt-dlp media module

* Refactored parse_upload_date

* Refactored media item upload_date_index

* Got media tests running

* Refactored media item table live

* Cleaned up the stragglers

* Fixed old oversight re: original_url

test/pinchflat/metadata/metadata_file_helpers_test.exs

@@ -132,10 +132,10 @@ defmodule Pinchflat.Metadata.MetadataFileHelpersTest do
   end
 
   describe "parse_upload_date/1" do
-    test "returns a date from the given metadata upload date" do
+    test "returns a datetime from the given metadata upload date" do
       upload_date = "20210101"
 
-      assert Helpers.parse_upload_date(upload_date) == ~D[2021-01-01]
+      assert Helpers.parse_upload_date(upload_date) == ~U[2021-01-01 00:00:00Z]
     end
   end