Unify HTTP client redirect behavior and provide configuration option

Update `ClientHttpRequestFactoryBuilder` implementations to ensure
that all libraries have consistent redirect follow behavior. Following
of redirects is enabled by default.

The `ClientHttpRequestFactorySettings` may be used to change if
redirects should be followed. The `spring.http.client.redirects`
property may also be used to update the default behavior.

Closes gh-42879

spring-boot-project/spring-boot-test/src/main/java/org/springframework/boot/test/web/client/TestRestTemplate.java

@@ -1018,7 +1018,7 @@ public class TestRestTemplate {
 		@SuppressWarnings("removal")
 		public CustomHttpComponentsClientHttpRequestFactory(HttpClientOption[] httpClientOptions,
 				org.springframework.boot.web.client.ClientHttpRequestFactorySettings settings) {
-			this(httpClientOptions, new ClientHttpRequestFactorySettings(settings.connectTimeout(),
+			this(httpClientOptions, new ClientHttpRequestFactorySettings(null, settings.connectTimeout(),
 					settings.readTimeout(), settings.sslBundle()));
 		}