Improve glimmer parse errors (#5161)

Instead of showing 80 carets, point out just which line the error was
on, and rely on the original message to point out the "column".

I thought about matching the `----^` in the original message with a
regex and use the length of it as the column number, but unfortunately
the original message does not show the original code (in this example
some whitespace is missing), so it wouldn't work.

Before:

```
$ ./bin/prettier.js test.hbs --parser glimmer
[error] test.hbs: SyntaxError: Parse error on line 2:
[error] {{one}}{{
[error] ---------^
[error] Expecting 'ID', 'STRING', 'NUMBER', 'BOOLEAN', 'UNDEFINED', 'NULL', 'DATA', got 'EOF' (2:0)
[error]   1 | {{one}}
[error] > 2 | {{
[error]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[error]   3 |
```

After:

```
$ ./bin/prettier.js test.hbs --parser glimmer
[error] test.hbs: SyntaxError: Parse error on line 2:
[error] {{one}}{{
[error] ---------^
[error] Expecting 'ID', 'STRING', 'NUMBER', 'BOOLEAN', 'UNDEFINED', 'NULL', 'DATA', got 'EOF' (2:0)
[error]   1 | {{one}}
[error] > 2 | {{
[error]   3 |
```

src/language-handlebars/parser-glimmer.js

@@ -34,8 +34,7 @@ function parse(text) {
     const matches = error.message.match(/on line (\d+)/);
     if (matches) {
       throw createError(error.message, {
-        start: { line: +matches[1], column: 0 },
-        end: { line: +matches[1], column: 80 }
+        start: { line: Number(matches[1]), column: 0 }
       });
     } else {
       throw error;