Backport PR
#5535: fix n^2 performance issue in coalesce_streams preprocessor...
Backport PR
#5535: fix n^2 performance issue in coalesce_streams preprocessor
for n consecutive stream outputs, `\r` fix would be compiled n times, and applied to each ith output (n-i) times.
- move pattern to module level
- apply replacement after coalescing outputs
An example notebook from nbviewer with ~1k outputs that was taking 90 seconds to render now takes 3 seconds.
