Moved workflow samples out of .github/workflows

The `.github/workflows` directory has additional permissions attached, preventing these
files from being by the Upgrade Gradle Wrapper plugin.

.github/workflow-samples/no-wrapper-gradle-5/build.gradle

@@ -0,0 +1,12 @@
+plugins {
+    id "com.gradle.build-scan" version "3.9" 
+}
+
+gradleEnterprise {
+    buildScan {
+        termsOfServiceUrl = "https://gradle.com/terms-of-service"
+        termsOfServiceAgree = "yes"
+        publishAlways()
+        uploadInBackground = false
+    }
+}