Make bad_request! API helper more generic

All other usages of `bad_request!` already expect this to be the case.

changelogs/unreleased/mk-fix-bad-request-helper.yml

+---
+title: Fix wording of some 400 Bad request API responses
+merge_request: 49895
+author:
+type: fixed

ee/spec/requests/api/analytics/project_deployment_frequency_spec.rb

@@ -70,7 +70,7 @@ RSpec.describe API::Analytics::ProjectDeploymentFrequency do
 
     it 'returns `bad_request` with expected message' do
       expect(response.parsed_body).to eq({
-        "message" => "400 (Bad request) \"Date range is greater than 91 days\" not given"
+        "message" => "400 Bad request - Date range is greater than 91 days"
       })
     end
   end
@@ -82,7 +82,7 @@ RSpec.describe API::Analytics::ProjectDeploymentFrequency do
 
     it 'returns `bad_request` with expected message' do
       expect(response.parsed_body).to eq({
-        "message" => "400 (Bad request) \"Parameter `to` is before the `from` date\" not given"
+        "message" => "400 Bad request - Parameter `to` is before the `from` date"
       })
     end
   end

lib/api/concerns/packages/npm_endpoints.rb

@@ -37,7 +37,7 @@ module API
             get 'dist-tags', format: false, requirements: ::API::Helpers::Packages::Npm::NPM_ENDPOINT_REQUIREMENTS do
               package_name = params[:package_name]
 
-              bad_request!('Package Name') if package_name.blank?
+              bad_request_missing_attribute!('Package Name') if package_name.blank?
 
               authorize_read_package!(project)
 
@@ -62,9 +62,9 @@ module API
                 version = env['api.request.body']
                 tag = params[:tag]
 
-                bad_request!('Package Name') if package_name.blank?
-                bad_request!('Version') if version.blank?
-                bad_request!('Tag') if tag.blank?
+                bad_request_missing_attribute!('Package Name') if package_name.blank?
+                bad_request_missing_attribute!('Version') if version.blank?
+                bad_request_missing_attribute!('Tag') if tag.blank?
 
                 authorize_create_package!(project)
 
@@ -85,8 +85,8 @@ module API
                 package_name = params[:package_name]
                 tag = params[:tag]
 
-                bad_request!('Package Name') if package_name.blank?
-                bad_request!('Tag') if tag.blank?
+                bad_request_missing_attribute!('Package Name') if package_name.blank?
+                bad_request_missing_attribute!('Tag') if tag.blank?
 
                 authorize_destroy_package!(project)
 

lib/api/go_proxy.rb

@@ -48,7 +48,7 @@ module API
         not_found! unless Feature.enabled?(:go_proxy, user_project)
 
         module_name = case_decode params[:module_name]
-        bad_request!('Module Name') if module_name.blank?
+        bad_request_missing_attribute!('Module Name') if module_name.blank?
 
         mod = ::Packages::Go::ModuleFinder.new(user_project, module_name).execute
 

lib/api/helpers.rb

@@ -322,7 +322,7 @@ module API
     #   keys (required) - A hash consisting of keys that must be present
     def required_attributes!(keys)
       keys.each do |key|
-        bad_request!(key) unless params[key].present?
+        bad_request_missing_attribute!(key) unless params[key].present?
       end
     end
 
@@ -368,12 +368,16 @@ module API
       render_api_error!(message.join(' '), 403)
     end
 
-    def bad_request!(attribute)
-      message = ["400 (Bad request)"]
-      message << "\"" + attribute.to_s + "\" not given" if attribute
+    def bad_request!(reason = nil)
+      message = ['400 Bad request']
+      message << "- #{reason}" if reason
       render_api_error!(message.join(' '), 400)
     end
 
+    def bad_request_missing_attribute!(attribute)
+      bad_request!("\"#{attribute}\" not given")
+    end
+
     def not_found!(resource = nil)
       message = ["404"]
       message << resource if resource