Review, refactor and polish (local) Spring Build Conventions Gradle Plugins.

Remove the gradle/maven-pom-editor.gradle build script as this logic (concern) is handled by the MavenPlushingConventionsPlugin.

Clean up associated Gradle project build scripts affected by the Gradle Plugin changes.

build.gradle

@@ -28,8 +28,6 @@ allprojects {
 
 	repositories {
 
-		mavenCentral()
-
 		if (version.contains('-')) {
 			maven { url "https://repo.spring.io/milestone" }
 		}
@@ -37,10 +35,6 @@ allprojects {
 			maven { url "https://repo.spring.io/snapshot" }
 		}
 	}
-
-	configurations.all {
-		resolutionStrategy.cacheChangingModulesFor 0, "minutes"
-	}
 }
 
 nohttp {
@@ -57,5 +51,3 @@ description = 'Spring Boot for Apache Geode'
 ext.snapshotBuild = Utils.isSnapshot(project)
 ext.milestoneBuild = Utils.isMilestone(project)
 ext.releaseBuild = Utils.isRelease(project)
-
-ext.MAVEN_POM_EDITOR_GRADLE = "$rootDir/gradle/maven-pom-editor.gradle"