[lldb] Add test to document alias tab completion behaviour #65760
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While looking at #49528 I found that, happily, aliases can now be tab completed.
However, if there is a built-in match that will always be taken. Which is a bit surprising, though logical if we don't want people really messing up their commands I guess.
Meaning "b" tab completes to our built-in breakpoint alias, before it looks at any of the aliases. "bf" doesn't match "b", so it looks through the aliases.
I didn't find any tests for this in the obvious places, so this adds some.