[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/podcasts/podcast_helpers_test.exs

@@ -26,9 +26,9 @@ defmodule Pinchflat.Podcasts.PodcastHelpersTest do
     test "orders by upload date where newest is first" do
       source = source_fixture()
 
-      oldest = media_item_with_attachments(%{source_id: source.id, upload_date: now_minus(2, :day)})
-      current = media_item_with_attachments(%{source_id: source.id, upload_date: now()})
-      older = media_item_with_attachments(%{source_id: source.id, upload_date: now_minus(1, :days)})
+      oldest = media_item_with_attachments(%{source_id: source.id, uploaded_at: now_minus(2, :day)})
+      current = media_item_with_attachments(%{source_id: source.id, uploaded_at: now()})
+      older = media_item_with_attachments(%{source_id: source.id, uploaded_at: now_minus(1, :days)})
 
       assert [^current, ^older, ^oldest] = PodcastHelpers.persisted_media_items_for(source)
     end