raccmonteiro b56ad92e25
++= appendAssign operator (#7346) (#7354)
# Description

Closes  https://github.com/nushell/nushell/issues/7346



# Tests + Formatting
```
> mut a = [1 2 3]
> $a ++= [4 5 6]
> $a
[1 2 3 4 5 6]
```
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