JvmBuildTarget#toString() throws `java.lang.NoClassDefFoundError`

[Tanish-Ranjan]

Calling jvmTarget.toString() at https://github.com/microsoft/vscode-gradle/blob/7c322dc34f620a88f58b63e21c789dd51e1dc5df/extension/jdtls.ext/com.microsoft.gradle.bs.importer/src/com/microsoft/gradle/bs/importer/GradleBuildServerBuildSupport.java#L588-L589 throws java.lang.NoClassDefFoundError with message org/eclipse/xtext/xbase/lib/util/ToStringBuilder.

JvmBuildTargetEx extends class JvmBuildTarget. The JvmBuildTarget#toString method uses eclipse xtext's toStringBuilder which seems to be absent at runtime resulting in the mentioned exception.