Set 'spring.docker.compose.readiness.wait' property in devtools

Default 'spring.docker.compose.readiness.wait' to `ONLY_IF_STARTED`
when using devtools.

See gh-35435

Author: philwebb

spring-boot-project/spring-boot-devtools/src/main/resources/org/springframework/boot/devtools/env/devtools-property-defaults.properties

@@ -14,3 +14,4 @@ spring.template.provider.cache=false
 spring.thymeleaf.cache=false
 spring.web.resources.cache.period=0
 spring.web.resources.chain.cache=false
+spring.docker.compose.readiness.wait=only-if-started