Wind 817830940b
raise ParseError if assign to a non-variable or non-mutable-variable (#14405)
# Description
While reviewing #14388, I think we can make some improvement on parser.

For the following code:
```nushell
let a = 3
a = 10   # should be error
$a = 10 # another error
```
I think they can raise `ParseError`, so nushell doesn't need to move
forward compiling IR block.

# User-Facing Changes
```nushell
let a = 3
a = 10
```
Will raise parse error instead of compile error.

# Tests + Formatting
Added 1 test.
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