Relocate projects to spring-boot-project

Move projects to better reflect the way that Spring Boot is released.

The following projects are under `spring-boot-project`:

  - `spring-boot`
  - `spring-boot-autoconfigure`
  - `spring-boot-tools`
  - `spring-boot-starters`
  - `spring-boot-actuator`
  - `spring-boot-actuator-autoconfigure`
  - `spring-boot-test`
  - `spring-boot-test-autoconfigure`
  - `spring-boot-devtools`
  - `spring-boot-cli`
  - `spring-boot-docs`

See gh-9316

spring-boot-project/spring-boot-cli/test-samples/integration_auto_test.groovy

@@ -0,0 +1,12 @@
+@SpringBootTest(classes=App)
+class AppTests {
+
+	@Autowired
+	MyService myService
+
+	@Test
+	void test() {
+		assertNotNull(myService)
+	}
+
+}