[lldb][windows] fix VT sequences overriding (lldb) prompt (#183366)
This patch fixes the `(lldb)` prompt being overwriten by the cursor
position movements the ConPTY emits.
To be a complete solution we should also add a resize hook for the
console's window.
I also think that we should look into injecting conpty VT sequences
before printing the `(lldb)` prompt.
For instance, if we break on a breakpoint and the pty added a "hide
cursor" VT sequence, we should emit a `show cursor` sequence before
printing `(lldb)`. This should be done outside of this PR however.