add Utils::Configuration.service_name_provided_by_user? global function

lib/datadog/ci/utils/configuration.rb

@@ -9,6 +9,10 @@ module Configuration
         def self.fetch_service_name(default)
           Datadog.configuration.service_without_fallback || CI::Git::LocalRepository.repository_name || default
         end
+
+        def self.service_name_provided_by_user?
+          !!Datadog.configuration.service_without_fallback
+        end
       end
     end
   end

sig/datadog/ci/utils/configuration.rbs

@@ -3,6 +3,8 @@ module Datadog
     module Utils
       module Configuration
         def self.fetch_service_name: (String default) -> String
+
+        def self.service_name_provided_by_user?: () -> bool
       end
     end
   end

spec/datadog/ci/utils/configuration_spec.rb

@@ -38,4 +38,24 @@
       end
     end
   end
+
+  describe ".service_name_provided_by_user?" do
+    subject { described_class.service_name_provided_by_user? }
+
+    before do
+      allow(::Datadog.configuration).to receive(:service_without_fallback).and_return(service)
+    end
+
+    context "when service is set in Datadog config" do
+      let(:service) { "service_without_fallback" }
+
+      it { is_expected.to be true }
+    end
+
+    context "when service is not set" do
+      let(:service) { nil }
+
+      it { is_expected.to be false }
+    end
+  end
 end