Consistent diff and blob size limit names

app/controllers/concerns/renders_blob.rb

app/controllers/projects/artifacts_controller.rb

app/controllers/projects/blob_controller.rb

app/controllers/projects/snippets_controller.rb

app/controllers/snippets_controller.rb

app/helpers/blob_helper.rb

app/helpers/diff_helper.rb

app/models/blob.rb

app/models/blob_viewer/auxiliary.rb

app/models/blob_viewer/base.rb

app/models/blob_viewer/client_side.rb

app/models/blob_viewer/server_side.rb

app/models/blob_viewer/text.rb

app/models/merge_request.rb

app/views/projects/diffs/_content.html.haml

app/views/projects/diffs/_diffs.html.haml

lib/api/commits.rb

lib/api/entities.rb

lib/api/v3/commits.rb

lib/api/v3/entities.rb