skip comments and eols while parsing pipeline (#10149)

This pr 
- fixes https://github.com/nushell/nushell/issues/10143
- fixes https://github.com/nushell/nushell/issues/5559

# Description

Current `lite_parse` does not handle multiple line comments and eols in
pipeline.
When parsing the following tokens:


| `"abcdefg"` | ` \|` | `# foobar` | ` \n` | `split chars` |
| ------------- | ------------- |------------- |-------------
|------------- |
| [Command] | [Pipe] | [Comment] | [Eol] | [Command] |
| | | Last Token |Current Token | |

`TokenContent::Eol` handler only checks if `last_token` is `Pipe` but it
will be broken if there exist any other thing, e.g. extra `[Comment]` in
this example.

This pr make the following change:

- While parsing `[Eol]`, try to find the last non-comment token as
`last_token`
- Comment is supposed as `[Comment]+` or `([Comment] [Eol])+`
- `[Eol]+` is still parsed just like current nu (i.e. generates
`nothing`).

Notice that this pr is just a quick patch if more comment/eol related
issue occures, `lite_parser` may need a rewrite.

# User-Facing Changes

Now the following pipeline works: 

```bash
1 | # comment
each { |it| $it + 2 } | # comment
math sum
```

Comment will not end the pipeline in interactive mode:

```bash
❯ 1 | # comment   (now enter multiple line mode instead of end)
▶▶ # foo
▶▶ 2
```

# Tests + Formatting

- 🟢 `toolkit fmt`
- 🟢 `toolkit clippy`
- 🟢 `toolkit test`
- 🟢 `toolkit test stdlib`

# After Submitting

None

---------

Co-authored-by: Horasal <horsal@horsal.dev>

src/tests/test_parser.rs

@@ -135,6 +135,41 @@ fn comment_skipping_2() -> TestResult {
     )
 }
 
+#[test]
+fn comment_skipping_in_pipeline_1() -> TestResult {
+    run_test(
+        r#"[1,2,3] | #comment
+        each { |$it| $it + 2 } | # foo
+        math sum #bar"#,
+        "12",
+    )
+}
+
+#[test]
+fn comment_skipping_in_pipeline_2() -> TestResult {
+    run_test(
+        r#"[1,2,3] #comment
+        | #comment2
+        each { |$it| $it + 2 } #foo
+        | # bar
+        math sum #baz"#,
+        "12",
+    )
+}
+
+#[test]
+fn comment_skipping_in_pipeline_3() -> TestResult {
+    run_test(
+        r#"[1,2,3] | #comment
+        #comment2
+        each { |$it| $it + 2 } #foo
+        | # bar
+        #baz
+        math sum #foobar"#,
+        "12",
+    )
+}
+
 #[test]
 fn bad_var_name() -> TestResult {
     fail_test(r#"let $"foo bar" = 4"#, "can't contain")