OidcBackChannelLogoutWebFilter make use of a servlet class

[Dyskal]

Describe the bug
The OidcBackChannelLogoutWebFilter class make use of an undefined status code when the project doesn't have spring-webmvc, and only spring-webflux on its classpath.

spring-security/config/src/main/java/org/springframework/security/config/web/server/OidcBackChannelLogoutWebFilter.java

Line 21 in 07a50b4

import jakarta.servlet.http.HttpServletResponse;

spring-security/config/src/main/java/org/springframework/security/config/web/server/OidcBackChannelLogoutWebFilter.java

Line 111 in 07a50b4

exchange.getResponse().setRawStatusCode(HttpServletResponse.SC_BAD_REQUEST);

Expected behavior
The class should make use of https://github.com/spring-projects/spring-framework/blob/bd83fb7021cab948dea1fee4a65e560a5bb4b4c0/spring-web/src/main/java/org/springframework/http/HttpStatus.java#L157 instead, with exchange.getResponse().setStatusCode(HttpStatus.BAD_REQUEST); .

[jzheaux]

Closed in favor of #17128