Allow spring properties to be used in logback <if> blocks

Reorder `SpringBootJoranConfigurator.addModelHandlerAssociations` so
that handlers are added before calling the super method. Prior to this
commit, handlers were added behind filters which prevented them from
being used in `<if>` blocks.

Fixes gh-33028

spring-boot-project/spring-boot-parent/build.gradle

@@ -55,6 +55,13 @@ bom {
 			]
 		}
 	}
+	library("Janino", "3.1.8") {
+		group("org.codehaus.janino") {
+			imports = [
+				"janino"
+			]
+		}
+	}
 	library("JLine", "2.11") {
 		prohibit("[2.12,)") {
 			because "it contains breaking changes"