Temporarily remove auto-config for Reactor context propagation

See gh-34201

Author: wilkinsona

spring-boot-project/spring-boot-autoconfigure/build.gradle

@@ -221,7 +221,6 @@ dependencies {
 	testImplementation("com.querydsl:querydsl-core")
 	testImplementation("com.squareup.okhttp3:mockwebserver")
 	testImplementation("com.sun.xml.messaging.saaj:saaj-impl")
-	testImplementation("io.micrometer:context-propagation")
 	testImplementation("io.projectreactor:reactor-test")
 	testImplementation("io.r2dbc:r2dbc-h2")
 	testImplementation("jakarta.json:jakarta.json-api")

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/reactor/ReactorAutoConfiguration.java

@@ -2176,10 +2176,6 @@
         "level": "error"
       }
     },
-    {
-      "name": "spring.reactor.context-propagation",
-      "defaultValue": "auto"
-    },
     {
       "name": "spring.reactor.stacktrace-mode.enabled",
       "description": "Whether Reactor should collect stacktrace information at runtime.",

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/reactor/ReactorProperties.java

@@ -93,7 +93,6 @@ org.springframework.boot.autoconfigure.neo4j.Neo4jAutoConfiguration
 org.springframework.boot.autoconfigure.netty.NettyAutoConfiguration
 org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration
 org.springframework.boot.autoconfigure.quartz.QuartzAutoConfiguration
-org.springframework.boot.autoconfigure.reactor.ReactorAutoConfiguration
 org.springframework.boot.autoconfigure.r2dbc.R2dbcAutoConfiguration
 org.springframework.boot.autoconfigure.r2dbc.R2dbcTransactionManagerAutoConfiguration
 org.springframework.boot.autoconfigure.rsocket.RSocketMessagingAutoConfiguration

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/reactor/package-info.java

@@ -21,7 +21,4 @@ For JDBC, the https://github.com/jdbc-observations/datasource-micrometer[Datasou
 Read more about it https://jdbc-observations.github.io/datasource-micrometer/docs/current/docs/html/[in the reference documentation].
 For R2DBC, the https://github.com/spring-projects-experimental/r2dbc-micrometer-spring-boot[Spring Boot Auto Configuration for R2DBC Observation] creates observations for R2DBC query invocations.
 
-Observability support relies on the https://github.com/micrometer-metrics/context-propagation[Context Propagation library] for forwarding the current observation across threads and reactive pipelines.
-`ThreadLocal` values are automatically reinstated in reactive operators, this behavior is controlled with the configprop:spring.reactor.context-propagation[] property.
-
 The next sections will provide more details about logging, metrics and traces.

spring-boot-project/spring-boot-autoconfigure/src/main/resources/META-INF/additional-spring-configuration-metadata.json

@@ -137,13 +137,6 @@ bom {
 			]
 		}
 	}
-	library("Micrometer Context Propagation", "1.0.2") {
-		group("io.micrometer") {
-			modules = [
-				"context-propagation"
-			]
-		}
-	}
 	library("MockK", "1.10.6") {
 		group("io.mockk") {
 			modules = [