Move SNOWPLOW_NAMESPACE to Snowplow destination class

lib/gitlab/tracking.rb

@@ -2,8 +2,6 @@
 
 module Gitlab
   module Tracking
-    SNOWPLOW_NAMESPACE = 'gl'
-
     class << self
       def enabled?
         snowplow_micro_enabled? || Gitlab::CurrentSettings.snowplow_enabled?

lib/gitlab/tracking/destinations/snowplow.rb

@@ -8,6 +8,8 @@ module Gitlab
       class Snowplow < Base
         extend ::Gitlab::Utils::Override
 
+        SNOWPLOW_NAMESPACE = 'gl'
+
         override :event
         def event(category, action, label: nil, property: nil, value: nil, context: nil)
           return unless enabled?
@@ -19,7 +21,7 @@ module Gitlab
         def options(group)
           additional_features = Feature.enabled?(:additional_snowplow_tracking, group, type: :ops)
           {
-            namespace: Gitlab::Tracking::SNOWPLOW_NAMESPACE,
+            namespace: SNOWPLOW_NAMESPACE,
             hostname: hostname,
             cookie_domain: cookie_domain,
             app_id: app_id,
@@ -54,7 +56,7 @@ module Gitlab
           @tracker ||= SnowplowTracker::Tracker.new(
             emitter,
             SnowplowTracker::Subject.new,
-            Gitlab::Tracking::SNOWPLOW_NAMESPACE,
+            SNOWPLOW_NAMESPACE,
             app_id
           )
         end

spec/lib/gitlab/tracking/destinations/snowplow_spec.rb

@@ -29,7 +29,7 @@ RSpec.describe Gitlab::Tracking::Destinations::Snowplow do
 
       expect(SnowplowTracker::Tracker)
         .to receive(:new)
-        .with(emitter, an_instance_of(SnowplowTracker::Subject), Gitlab::Tracking::SNOWPLOW_NAMESPACE, '_abc123_')
+        .with(emitter, an_instance_of(SnowplowTracker::Subject), described_class::SNOWPLOW_NAMESPACE, '_abc123_')
         .and_return(tracker)
     end