Wind 0a2fb137af
don't run subcommand if it's surrounded with backtick quote (#14210)
# Description
Fixes: #14202
After looking into the issue, I think #13910 it's not good to cut the
span if it's in external argument.
This pr is somehow revert the change, and fix
https://github.com/nushell/nushell/issues/13431 in another way.

It introduce a new state named `State::BackTickQuote`, so if an external
arg include backtick quote, it enters the state, so backtick quote won't
be the body of a string.

# User-Facing Changes
### Before
```nushell
> ^echo `(echo aa)`
aa
> ^echo `"aa"`   # maybe it's not right to remove the inner quote.
aa
```
### After
```nushell
> ^echo `(echo aa)`
(echo aa)
> ^echo `"aa"`    # inner quote is keeped if there are backtick quote outside.
"aa"
```

# Tests + Formatting
Added 3 tests.
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These sub-crates form both the foundation for Nu and a set of plugins which extend Nu with additional functionality.

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