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/failures.groovy

@@ -0,0 +1,36 @@
+class FailingJUnitTests {
+	@Test
+	void passingTest() {
+		assertTrue(true)
+	}
+
+	@Test
+	void failureByAssertion() {
+		assertTrue(false)
+	}
+
+	@Test
+	void failureByException() {
+		throw new RuntimeException("This should also be handled")
+	}
+}
+
+class FailingSpockTest extends Specification {
+	def "this should pass"() {
+		expect:
+		name.size() == length
+
+		where:
+		name    | length
+		"Spock" | 5
+	}
+
+	def "this should fail on purpose as well"() {
+		when:
+		String text = "Greetings"
+
+		then:
+		//throw new RuntimeException("This should fail!")
+		true == false
+	}
+}