Allow blob viewer to support multiple filetypes

app/models/blob_viewer/base.rb

@@ -2,7 +2,7 @@ module BlobViewer
   class Base
     PARTIAL_PATH_PREFIX = 'projects/blob/viewers'.freeze
-    class_attribute :partial_name, :loading_partial_name, :type, :extensions, :file_type, :client_side, :binary, :switcher_icon, :switcher_title, :max_size, :absolute_max_size
+    class_attribute :partial_name, :loading_partial_name, :type, :extensions, :file_types, :client_side, :binary, :switcher_icon, :switcher_title, :max_size, :absolute_max_size
     self.loading_partial_name = 'loading'
@@ -54,17 +54,17 @@ module BlobViewer
     def self.can_render?(blob, verify_binary: true)
       return false if verify_binary && binary? != blob.binary?
       return true if extensions&.include?(blob.extension)
-      return true if file_type && Gitlab::FileDetector.type_of(blob.path) == file_type
+      return true if file_types&.include?(Gitlab::FileDetector.type_of(blob.path))
       false
     end
     def too_large?
-      blob.raw_size > max_size
+      max_size && blob.raw_size > max_size
     end
     def absolutely_too_large?
-      blob.raw_size > absolute_max_size
+      absolute_max_size && blob.raw_size > absolute_max_size
     end
     def can_override_max_size?

app/models/blob_viewer/gitlab_ci_yml.rb

@@ -5,7 +5,7 @@ module BlobViewer
     self.partial_name = 'gitlab_ci_yml'
     self.loading_partial_name = 'gitlab_ci_yml_loading'
-    self.file_type = :gitlab_ci
+    self.file_types = %i(gitlab_ci)
     self.binary = false
     def validation_message

app/models/blob_viewer/license.rb

@@ -7,7 +7,7 @@ module BlobViewer
     include Auxiliary
     self.partial_name = 'license'
-    self.file_type = :license
+    self.file_types = %i(license)
     self.binary = false
     def license

app/models/blob_viewer/route_map.rb

@@ -5,7 +5,7 @@ module BlobViewer
     self.partial_name = 'route_map'
     self.loading_partial_name = 'route_map_loading'
-    self.file_type = :route_map
+    self.file_types = %i(route_map)
     self.binary = false
     def validation_message