Remove Spring Cloud Connectors auto-config/starter

The Spring Cloud Connectors project has been deprecated in favor of the
Java CFEnv project. The Boot auto-configuration and starter that support
Connectors were deprecated in Boot 2.2.

This commit removes the Connectors auto-configuration, starter,
and dependency management.

Closes gh-19798

Author: scottfrederick

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

@@ -140,7 +140,6 @@ dependencies {
 	optional 'org.springframework.session:spring-session-jdbc'
 	optional 'org.springframework.amqp:spring-rabbit'
 	optional 'org.springframework.kafka:spring-kafka'
-	optional 'org.springframework.cloud:spring-cloud-spring-service-connector'
 	optional 'org.springframework.ws:spring-ws-core'
 	optional 'org.thymeleaf:thymeleaf'
 	optional 'org.thymeleaf:thymeleaf-spring5'

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/cloud/CloudServiceConnectorsAutoConfiguration.java

@@ -25,7 +25,6 @@ org.springframework.boot.autoconfigure.amqp.RabbitAutoConfiguration,\
 org.springframework.boot.autoconfigure.batch.BatchAutoConfiguration,\
 org.springframework.boot.autoconfigure.cache.CacheAutoConfiguration,\
 org.springframework.boot.autoconfigure.cassandra.CassandraAutoConfiguration,\
-org.springframework.boot.autoconfigure.cloud.CloudServiceConnectorsAutoConfiguration,\
 org.springframework.boot.autoconfigure.context.ConfigurationPropertiesAutoConfiguration,\
 org.springframework.boot.autoconfigure.context.MessageSourceAutoConfiguration,\
 org.springframework.boot.autoconfigure.context.PropertyPlaceholderAutoConfiguration,\

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

@@ -1437,7 +1437,6 @@ bom {
 				'spring-boot-starter-artemis',
 				'spring-boot-starter-batch',
 				'spring-boot-starter-cache',
-				'spring-boot-starter-cloud-connectors',
 				'spring-boot-starter-data-cassandra',
 				'spring-boot-starter-data-cassandra-reactive',
 				'spring-boot-starter-data-couchbase',
@@ -1600,17 +1599,6 @@ bom {
 			]
 		}
 	}
-	library('Spring Cloud Connectors', '2.0.7.RELEASE') {
-		group('org.springframework.cloud') {
-			modules = [
-				'spring-cloud-cloudfoundry-connector',
-				'spring-cloud-connectors-core',
-				'spring-cloud-heroku-connector',
-				'spring-cloud-localconfig-connector',
-				'spring-cloud-spring-service-connector'
-			]
-		}
-	}
 	library('Spring Data Releasetrain', 'Neumann-M2') {
 		group('org.springframework.data') {
 			imports = [