Remove eclipse plugin since it's not necessary to apply it

Both Eclipse, via Buildship, and Intellij automatically add in init
scripts that run with the Gradle execution. In these they add in the
eclipse or idea plugins, so that those ide's get associated
configurations and tasks necessary for them.

spring-cloud-contract-tools/spring-cloud-contract-gradle-plugin/build.gradle

@@ -36,7 +36,6 @@ project.version = findProperty('verifierVersion')
 apply plugin: 'groovy'
 apply plugin: "java-gradle-plugin"
 apply from: "$rootDir/gradle/release.gradle"
-apply plugin: 'eclipse'
 //apply plugin: "jacoco"
 
 group = 'org.springframework.cloud'