Revert "Add Pleroma.Upload.Filter.HeifToJpeg based on vips"

This reverts commit 31d4448ee61b4afac6aa23f8c0287d13aed411a1.

This functionality is not reliably working with vips/vix due to codec patent junk

test/pleroma/upload/filter/heif_to_jpeg_test.exs

@@ -1,38 +0,0 @@
-# Pleroma: A lightweight social networking server
-# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
-# SPDX-License-Identifier: AGPL-3.0-only
-
-defmodule Pleroma.Upload.Filter.HeifToJpegTest do
-  use Pleroma.DataCase, async: true
-  alias Pleroma.Upload.Filter
-
-  test "apply HeicToJpeg filter" do
-    File.cp!(
-      "test/fixtures/image.heic",
-      "test/fixtures/heictmp"
-    )
-
-    upload = %Pleroma.Upload{
-      name: "image.heic",
-      content_type: "image/heic",
-      path: Path.absname("test/fixtures/image.heic"),
-      tempfile: Path.absname("test/fixtures/heictmp")
-    }
-
-    {:ok, :filtered, result} = Filter.HeifToJpeg.filter(upload)
-
-    assert result.content_type == "image/jpeg"
-    assert result.name == "image.jpg"
-    assert String.ends_with?(result.path, "jpg")
-
-    assert {:ok,
-            %Majic.Result{
-              content:
-                "JPEG image data, JFIF standard 1.02, resolution (DPI), density 96x96, segment length 16, progressive, precision 8, 1024x768, components 3",
-              encoding: "binary",
-              mime_type: "image/jpeg"
-            }} == Majic.perform(result.path, pool: Pleroma.MajicPool)
-
-    on_exit(fn -> File.rm!("test/fixtures/heictmp") end)
-  end
-end