Go: don't pick the container variant off the first element

[greg-at-moderne]

What's changed?

Stops containerFromElements (part of the RPC) from picking the container variant off the first element (which silently drops Statement-only entries like Return/If when the first element is an Expression).

What's your motivation?

Otherwise, RPC failures are observed when running Go recipes. The symptoms might include:

org.openrewrite.internal.RecipeRunException: java.lang.NullPointerException: Cannot invoke "org.openrewrite.java.tree.J.getId()" because the return value of "org.openrewrite.java.tree.JRightPadded.getElement()" is null
        at org.openrewrite.TreeVisitor.visit(TreeVisitor.java:278)
        at org.openrewrite.golang.internal.rpc.GolangSender$GolangSenderDelegate.visit(GolangSender.java:235)
        at org.openrewrite.golang.internal.rpc.GolangSender$GolangSenderDelegate.visit(GolangSender.java:223)
        at org.openrewrite.java.internal.rpc.JavaSender.lambda$visitRightPadded$296(JavaSender.java:606)
        at org.openrewrite.rpc.RpcSendQueue.lambda$getAndSend$0(RpcSendQueue.java:83)