build: Update Gradle and plugins, small cleanup to build scripts

build-logic/src/main/kotlin/cloud.example-conventions.gradle.kts

@@ -0,0 +1,12 @@
+plugins {
+    id("cloud.base-conventions")
+}
+
+extensions.create<CloudExampleExtension>("cloudExample")
+
+// Only compile examples on CI, or when the compile-examples property exists
+if (!ci.get() && !compileExamples) {
+    tasks.configureEach {
+        onlyIf { false }
+    }
+}