YamlEditor: replacing text throws runtime error if currentText is longer than new text

Programmatically updating the text of the yaml editor, either by using ref.current.replaceValue or by using merge={({text}) => {return {text: text}}), fails if the text currently within the editor is more characters than the new text. The error message is `RangeError: Selection points outside of document`, and is thrown by codemirror/text/dist/index.cjs/Transaction constructor.

replaceText example:

```
const yamlEditorRef = useRef(null);
...
{ yamlEditorRef.current.replaceValue({ text: "foo: bar" }); }}>Reset

```
merge example:

```
const [exampleYaml, setExampleYaml] = useState("");
const handleYamlChange = ({ json, text }: { json: any, text: string }) => {
setExampleYaml(text);
}
const handleMerge = ({ json, text, currentText }: { json: any, text: string, currentText: string }) => {
return { text: text };
...
{ setExampleYaml("foo: bar"); }}>Reset

```
In both of these cases, if the text box currently has something shorter than or equal to "foo: bar", such as "12345678", this will succeed. If the text box has more characters, it will fail with that RangeError.