fix #1342 Let collectList discard accumulated elements on error/cancel

[simonbasle]

cc @smaldini @rstoyanchev

[codecov-io]

Codecov Report

Merging #1345 into master will increase coverage by 0.15%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master    #1345      +/-   ##
============================================
+ Coverage     83.93%   84.09%   +0.15%     
- Complexity     3852     3857       +5     
============================================
  Files           356      356              
  Lines         29355    29377      +22     
  Branches       5434     5446      +12     
============================================
+ Hits          24640    24704      +64     
+ Misses         3098     3066      -32     
+ Partials       1617     1607      -10

Impacted Files	Coverage Δ	Complexity Δ
...n/java/reactor/core/publisher/MonoCollectList.java	80% <100%> (+1.05%)	2 <0> (ø)	⬇️
...ore/src/main/java/reactor/core/publisher/Flux.java	98.73% <0%> (+0.01%)	509% <0%> (ø)	⬇️
...ava/reactor/core/publisher/FluxBufferBoundary.java	93.66% <0%> (+0.04%)	3% <0%> (ø)	⬇️
...va/reactor/core/publisher/FluxMergeSequential.java	82.17% <0%> (+0.06%)	6% <0%> (ø)	⬇️
...java/reactor/core/scheduler/ExecutorScheduler.java	78.76% <0%> (+0.14%)	12% <0%> (ø)	⬇️
...c/main/java/reactor/core/publisher/FluxReplay.java	83.9% <0%> (+0.3%)	25% <0%> (+1%)	⬆️
...n/java/reactor/core/publisher/ImmutableSignal.java	84.78% <0%> (+0.33%)	23% <0%> (ø)	⬇️
...eactor/core/publisher/ParallelMergeSequential.java	80.31% <0%> (+0.51%)	7% <0%> (ø)	⬇️
...c/main/java/reactor/core/publisher/RingBuffer.java	71.51% <0%> (+0.94%)	24% <0%> (ø)	⬇️
...ava/reactor/core/publisher/EventLoopProcessor.java	80.82% <0%> (+1.03%)	53% <0%> (+2%)	⬆️
... and 8 more

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