Refactor to support multiple parse errors (#8765)

# Description

This is a pretty heavy refactor of the parser to support multiple parser
errors. It has a few issues we should address before landing:

- [x] In some cases, error quality has gotten worse `1 / "bob"` for
example
- [x] if/else isn't currently parsing correctly
- probably others

# User-Facing Changes

This may have error quality degradation as we adjust to the new error
reporting mechanism.

# Tests + Formatting

Don't forget to add tests that cover your changes.

Make sure you've run and fixed any issues with these commands:

- `cargo fmt --all -- --check` to check standard code formatting (`cargo
fmt --all` applies these changes)
- `cargo clippy --workspace -- -D warnings -D clippy::unwrap_used -A
clippy::needless_collect` to check that you're using the standard code
style
- `cargo test --workspace` to check that all tests pass
- `cargo run -- crates/nu-utils/standard_library/tests.nu` to run the
tests for the standard library

> **Note**
> from `nushell` you can also use the `toolkit` as follows
> ```bash
> use toolkit.nu # or use an `env_change` hook to activate it
automatically
> toolkit check pr
> ```

# After Submitting

If your PR had any user-facing changes, update [the
documentation](https://github.com/nushell/nushell.github.io) after the
PR is merged, if necessary. This will help us keep the docs up to date.

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

@@ -64,10 +64,9 @@ impl Command for FromNuon {
         let engine_state = engine_state.clone();
 
         let mut working_set = StateWorkingSet::new(&engine_state);
-        let mut error = None;
-        let (mut block, err) =
+
+        let mut block =
             nu_parser::parse(&mut working_set, None, string_input.as_bytes(), false, &[]);
-        error = error.or(err);
 
         if let Some(pipeline) = block.pipelines.get(1) {
             if let Some(element) = pipeline.elements.get(0) {
@@ -146,7 +145,7 @@ impl Command for FromNuon {
             }
         };
 
-        if let Some(err) = error {
+        if let Some(err) = working_set.parse_errors.first() {
             return Err(ShellError::GenericError(
                 "error when parsing nuon text".into(),
                 "could not parse nuon text".into(),