Wind b7af715f6b
IR: Don't generate instructions for def and export def. (#14114)
# Description
Fixes: #14110
Fixes: #14087

I think it's ok to not generating instruction to `def` and `export def`
call. Because they just return `PipelineData::Empty` without doing
anything.

If nushell generates instructions for `def` and `export def`, nushell
will try to capture variables for these block. It's not the time to do
this.

# User-Facing Changes
```
nu -c "
def bar [] {
    let x = 1
    ($x | foo)
}
def foo [] {
    foo
}
" 
```
Will no longer raise error.

# Tests + Formatting
Added 4 tests
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