gh-127073: Clear completion list when KeyboardInterrupt occurs

[Natural-selection1]

Closes 127073

Issue: #127073

Previous behavior:

• The completion list persisted after KeyboardInterrupt and always there.

int.<TAB><TAB>

int.as_integer_ratio( int.bit_length( int.denominatorint.imagint.mro() int.realint.bit_count( int.conjugate( int.from_bytes( int.is_integer( int.numeratorint.to_bytes(
>>>int.

<Ctrl+C>

int.as_integer_ratio( int.bit_length( int.denominatorint.imagint.mro() int.realint.bit_count( int.conjugate( int.from_bytes( int.is_integer( int.numeratorint.to_bytes(
>>>int.
KeyboardInterruptint.as_integer_ratio( int.bit_length( int.denominatorint.imagint.mro() int.realint.bit_count( int.conjugate( int.from_bytes( int.is_integer( int.numeratorint.to_bytes(
>>>

<Ctrl+C> again

int.as_integer_ratio( int.bit_length( int.denominatorint.imagint.mro() int.realint.bit_count( int.conjugate( int.from_bytes( int.is_integer( int.numeratorint.to_bytes(
>>>int.
KeyboardInterruptint.as_integer_ratio( int.bit_length( int.denominatorint.imagint.mro() int.realint.bit_count( int.conjugate( int.from_bytes( int.is_integer( int.numeratorint.to_bytes(
>>>KeyboardInterruptint.as_integer_ratio( int.bit_length( int.denominatorint.imagint.mro() int.realint.bit_count( int.conjugate( int.from_bytes( int.is_integer( int.numeratorint.to_bytes(
>>>

New behavior:

• The completion list is properly cleared on KeyboardInterrupt just consistent with the behavior of other errors

int.<TAB><TAB>

int.as_integer_ratio( int.bit_length( int.denominatorint.imagint.mro() int.realint.bit_count( int.conjugate( int.from_bytes( int.is_integer( int.numeratorint.to_bytes(
>>>int.

<Ctrl+C>

>>>int.
KeyboardInterrupt>>>

• Issue: New Python REPL double-prints completion suggestions #127073

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