Fix Sentry not reporting right program for Sidekiq workers

Moves program tag into the global configuration since this doesn't
change and since Sidekiq workers get a unique context for each event.

Closes #21410

app/helpers/sentry_helper.rb

 module SentryHelper
   def sentry_enabled?
-    Rails.env.production? && current_application_settings.sentry_enabled?
+    Gitlab::Sentry.enabled?
   end
 
   def sentry_context
-    return unless sentry_enabled?
-
-    if current_user
-      Raven.user_context(
-        id: current_user.id,
-        email: current_user.email,
-        username: current_user.username,
-      )
-    end
-
-    Raven.tags_context(program: sentry_program_context)
-  end
-
-  def sentry_program_context
-    if Sidekiq.server?
-      'sidekiq'
-    else
-      'rails'
-    end
+    Gitlab::Sentry.context(current_user)
   end
 end

config/initializers/sentry.rb

@@ -18,6 +18,7 @@ if Rails.env.production?
       
       # Sanitize fields based on those sanitized from Rails.
       config.sanitize_fields = Rails.application.config.filter_parameters.map(&:to_s)
+      config.tags = { program: Gitlab::Sentry.program_context }
     end
   end
 end

lib/gitlab/sentry.rb

+module Gitlab
+  module Sentry
+    def self.enabled?
+      Rails.env.production? && current_application_settings.sentry_enabled?
+    end
+
+    def self.context(current_user = nil)
+      return unless self.enabled?
+
+      if current_user
+        Raven.user_context(
+          id: current_user.id,
+          email: current_user.email,
+          username: current_user.username,
+        )
+      end
+    end
+
+    def self.program_context
+      if Sidekiq.server?
+        'sidekiq'
+      else
+        'rails'
+      end
+    end
+  end
+end