Revert "Pipeline operators: && and ||" (#7452)

Reverts nushell/nushell#7448

Some surprising behavior in how we do this. For example:

```
〉if (true || false) { print "yes!" } else { print "no!" }
no!
〉if (true or false) { print "yes!" } else { print "no!" }
yes!
```

This means for folks who are using the old `||`, they possibly get the
wrong answer once they upgrade. I don't think we can ship with that as
it will catch too many people by surprise and just make it easier to
write buggy code.

crates/nu-command/src/formats/from/nuon.rs

@@ -146,6 +146,7 @@ impl Command for FromNuon {
                 match pipeline.elements.remove(0) {
                     PipelineElement::Expression(_, expression)
                     | PipelineElement::Redirection(_, _, expression)
+                    | PipelineElement::And(_, expression)
                     | PipelineElement::Or(_, expression) => expression,
                 }
             }