Filter Geo proxied data from api_json.log

Currently the base64-encoded value of the push-to-secondary data is
saved in `api_json.log`, and this can easily be hundreds of
megabytes. We should filter this from the logs.

lib/api/api.rb

@@ -10,13 +10,14 @@ module API
     NAMESPACE_OR_PROJECT_REQUIREMENTS = { id: NO_SLASH_URL_PART_REGEX }.freeze
     COMMIT_ENDPOINT_REQUIREMENTS = NAMESPACE_OR_PROJECT_REQUIREMENTS.merge(sha: NO_SLASH_URL_PART_REGEX).freeze
     USER_REQUIREMENTS = { user_id: NO_SLASH_URL_PART_REGEX }.freeze
+    LOG_FILTERS = ::Rails.application.config.filter_parameters + [/^output$/]
 
     insert_before Grape::Middleware::Error,
                   GrapeLogging::Middleware::RequestLogger,
                   logger: Logger.new(LOG_FILENAME),
                   formatter: Gitlab::GrapeLogging::Formatters::LogrageWithTimestamp.new,
                   include: [
-                    GrapeLogging::Loggers::FilterParameters.new,
+                    GrapeLogging::Loggers::FilterParameters.new(LOG_FILTERS),
                     GrapeLogging::Loggers::ClientEnv.new,
                     Gitlab::GrapeLogging::Loggers::RouteLogger.new,
                     Gitlab::GrapeLogging::Loggers::UserLogger.new,