Remove .com check in storage alert helper

GL.com checks are not preferred and not needed when an application
setting can be used.  In these cases, the app setting checks were
already in place so the .com checks were not necessary.

ee/app/helpers/ee/namespace_storage_limit_alert_helper.rb

@@ -47,7 +47,6 @@ module EE
     end
 
     def can_purchase_storage_for_namespace?(namespace)
-      ::Gitlab.dev_env_or_com? &&
       ::Gitlab::CurrentSettings.automatic_purchased_storage_allocation? &&
         ::Feature.enabled?(:buy_storage_link) &&
         namespace.additional_repo_storage_by_namespace_enabled?
@@ -62,7 +61,6 @@ module EE
     end
 
     def can_purchase_storage?
-      ::Gitlab.dev_env_or_com? &&
       ::Gitlab::CurrentSettings.enforce_namespace_storage_limit? &&
         ::Feature.enabled?(:buy_storage_link)
     end

ee/spec/helpers/ee/namespace_storage_limit_alert_helper_spec.rb

@@ -75,20 +75,15 @@ RSpec.describe EE::NamespaceStorageLimitAlertHelper do
   describe '#can_purchase_storage?' do
     subject { helper.can_purchase_storage? }
 
-    where(:is_dot_com, :enforcement_setting_enabled, :feature_enabled, :result) do
-      false | false | false | false
-      false | false | true  | false
-      false | true  | false | false
-      true  | false | false | false
-      false | true  | true  | false
-      true  | true  | false | false
-      true  | false | true  | false
-      true  | true  | true  | true
+    where(:enforcement_setting_enabled, :feature_enabled, :result) do
+      false | false | false
+      false | true  | false
+      true  | false | false
+      true  | true  | true
     end
 
     with_them do
       before do
-        allow(::Gitlab).to receive(:com?).and_return(is_dot_com)
         stub_application_setting(enforce_namespace_storage_limit: enforcement_setting_enabled)
         stub_feature_flags(buy_storage_link: feature_enabled)
       end
@@ -209,7 +204,6 @@ RSpec.describe EE::NamespaceStorageLimitAlertHelper do
     let_it_be(:namespace) { build(:namespace) }
 
     where(
-      is_dev_or_com: [true, false],
       auto_storage_allocation_enabled: [true, false],
       buy_storage_link_enabled: [true, false],
       namespace_storage_limit_enabled: [true, false],
@@ -218,7 +212,6 @@ RSpec.describe EE::NamespaceStorageLimitAlertHelper do
 
     with_them do
       let(:result) do
-        is_dev_or_com &&
         auto_storage_allocation_enabled &&
           buy_storage_link_enabled &&
           !namespace_storage_limit_enabled &&
@@ -226,7 +219,6 @@ RSpec.describe EE::NamespaceStorageLimitAlertHelper do
       end
 
       before do
-        allow(::Gitlab).to receive(:dev_env_or_com?).and_return(is_dev_or_com)
         stub_application_setting(automatic_purchased_storage_allocation: auto_storage_allocation_enabled)
         stub_feature_flags(
           namespace_storage_limit: namespace_storage_limit_enabled,