Deprecate SignalFX tests

See gh-43962

Author: mhalbritter

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/metrics/export/signalfx/SignalFxMetricsExportAutoConfigurationTests.java

@@ -33,8 +33,10 @@
  * Tests for {@link SignalFxMetricsExportAutoConfiguration}.
  *
  * @author Andy Wilkinson
+ * @deprecated since 3.5.0 for removal in 3.7.0
  */
 @SuppressWarnings("removal")
+@Deprecated(since = "3.5.0", forRemoval = true)
 class SignalFxMetricsExportAutoConfigurationTests {
 
 	private final ApplicationContextRunner contextRunner = new ApplicationContextRunner()

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/metrics/export/signalfx/SignalFxPropertiesConfigAdapterTests.java

@@ -26,8 +26,10 @@
  * Tests for {@link SignalFxPropertiesConfigAdapter}.
  *
  * @author Mirko Sobeck
+ * @deprecated since 3.5.0 for removal in 3.7.0
  */
 @SuppressWarnings("removal")
+@Deprecated(since = "3.5.0", forRemoval = true)
 class SignalFxPropertiesConfigAdapterTests
 		extends StepRegistryPropertiesConfigAdapterTests<SignalFxProperties, SignalFxPropertiesConfigAdapter> {
 

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/metrics/export/signalfx/SignalFxPropertiesTests.java

@@ -27,8 +27,10 @@
  * Tests for {@link SignalFxProperties}.
  *
  * @author Stephane Nicoll
+ * @deprecated since 3.5.0 for removal in 3.7.0
  */
 @SuppressWarnings("removal")
+@Deprecated(since = "3.5.0", forRemoval = true)
 class SignalFxPropertiesTests extends StepRegistryPropertiesTests {
 
 	@Test