Retain original case when mapping endpoint paths

Update `MappingWebEndpointPathMapper` to keep the original case rather
than using a lower-case version.

Closes gh-14773

Author: philwebb

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/endpoint/web/MappingWebEndpointPathMapper.java

@@ -46,7 +46,7 @@ public String getRootPath(String endpointId) {
 
 	@Override
 	public String getRootPath(EndpointId endpointId) {
-		return this.pathMapping.getOrDefault(endpointId, endpointId.toLowerCaseString());
+		return this.pathMapping.getOrDefault(endpointId, endpointId.toString());
 	}
 
 }

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/endpoint/web/MappingWebEndpointPathMapperTests.java

@@ -50,7 +50,7 @@ public void mixedCaseDefaultConfiguration() {
 		MappingWebEndpointPathMapper mapper = new MappingWebEndpointPathMapper(
 				Collections.emptyMap());
 		assertThat(mapper.getRootPath(EndpointId.of("testEndpoint")))
-				.isEqualTo("testendpoint");
+				.isEqualTo("testEndpoint");
 	}
 
 	@Test

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/web/PathMapper.java

@@ -63,7 +63,7 @@ public String getRootPath(String endpointId) {
 
 			@Override
 			public String getRootPath(EndpointId endpointId) {
-				return endpointId.toLowerCaseString();
+				return endpointId.toString();
 			}
 
 		};