fix(storage): migrate all blob content types

Remove the image-only filter so storage migrations copy every Active Storage blob, including audio, documents, imports, exports, and enterprise attachments.

lib/active_storage/migrator.rb

@@ -35,8 +35,6 @@ class ActiveStorage::Migrator
   def self.migrate_blobs(_from_service, to_service, to_service_name, update_service_name: true)
     # Configure the blob service for the source service
     ActiveStorage::Blob.find_each do |blob|
-      next unless blob.image?
-
       Rails.logger.debug { '.' }
 
       blob.open do |io|

spec/lib/active_storage/migrator_spec.rb

@@ -39,7 +39,7 @@ RSpec.describe ActiveStorage::Migrator do
   describe '.migrate_blobs' do
     let(:from_service_stub) { instance_double(ActiveStorage::Service) }
     let(:to_service_stub) { instance_double(ActiveStorage::Service) }
-    let(:blob) { instance_double(ActiveStorage::Blob, image?: true, key: 'blob-key', checksum: 'checksum') }
+    let(:blob) { instance_double(ActiveStorage::Blob, key: 'blob-key', checksum: 'checksum') }
     let(:io) { StringIO.new('blob-content') }
 
     before do
@@ -47,7 +47,7 @@ RSpec.describe ActiveStorage::Migrator do
       allow(blob).to receive(:open).and_yield(io)
     end
 
-    it 'updates the blob service after uploading to the target service' do
+    it 'migrates blobs regardless of content type' do
       expect(to_service_stub).to receive(:upload).with('blob-key', io, checksum: 'checksum').ordered
       expect(blob).to receive(:update!).with(service_name: 'amazon').ordered