Simplify Uni to Multi bridge

[jponge]

No description provided.

[jponge]

This shortcut saves allocations

[codecov]

Codecov Report

Merging #631 (b4b19bf) into main (941c555) will increase coverage by 0.31%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##               main     #631      +/-   ##
============================================
+ Coverage     89.93%   90.24%   +0.31%     
- Complexity     3015     3024       +9     
============================================
  Files           395      395              
  Lines         11829    11829              
  Branches       1478     1480       +2     
============================================
+ Hits          10638    10675      +37     
+ Misses          607      590      -17     
+ Partials        584      564      -20     

Impacted Files	Coverage Δ
...rye/mutiny/converters/uni/UniToMultiPublisher.java	88.88% <ø> (ø)
...java/io/smallrye/mutiny/operators/AbstractUni.java	90.00% <100.00%> (ø)
...mallrye/mutiny/helpers/queues/MpscLinkedQueue.java	90.32% <0.00%> (-8.07%)	⬇️
...mallrye/mutiny/operators/multi/MultiFlatMapOp.java	85.04% <0.00%> (+0.62%)	⬆️
...smallrye/mutiny/operators/multi/MultiEmitOnOp.java	90.47% <0.00%> (+0.95%)	⬆️
...allrye/mutiny/operators/uni/UniAndCombination.java	89.53% <0.00%> (+1.16%)	⬆️
...erators/multi/builders/SerializedMultiEmitter.java	82.27% <0.00%> (+1.26%)	⬆️
...tiny/operators/multi/MultiBufferWithTimeoutOp.java	74.78% <0.00%> (+1.68%)	⬆️
...subscription/SwitchableSubscriptionSubscriber.java	97.54% <0.00%> (+2.45%)	⬆️
...y/operators/multi/builders/IterableBasedMulti.java	86.17% <0.00%> (+4.25%)	⬆️
... and 5 more