Rename awaitPrincipal to awaitPrincipalOrNull

See spring-projectsgh-19975

Author: sdeleuze

spring-webflux/src/main/kotlin/org/springframework/web/reactive/function/server/ServerRequestExtensions.kt

@@ -90,7 +90,7 @@ suspend fun ServerRequest.awaitMultipartData(): MultiValueMap<String, Part> =
  * @author Sebastien Deleuze
  * @since 5.2
  */
-suspend fun ServerRequest.awaitPrincipal(): Principal? =
+suspend fun ServerRequest.awaitPrincipalOrNull(): Principal? =
 		principal().awaitFirstOrNull()
 
 /**

spring-webflux/src/test/kotlin/org/springframework/web/reactive/function/server/ServerRequestExtensionsTests.kt

@@ -91,7 +91,7 @@ class ServerRequestExtensionsTests {
 		val principal = mockk<Principal>()
 		every { request.principal() } returns Mono.just(principal)
 		runBlocking {
-			assertEquals(principal, request.awaitPrincipal())
+			assertEquals(principal, request.awaitPrincipalOrNull())
 		}
 	}