Round of deprecation removals and misc cleanups ahead of 1.3.0

[jponge]

No description provided.

[codecov]

Codecov Report

Merging #796 (f2b406c) into main (4577875) will increase coverage by 0.30%.
The diff coverage is 71.42%.

❗ Current head f2b406c differs from pull request most recent head 92d3b10. Consider uploading reports for the commit 92d3b10 to get more accurate results

@@             Coverage Diff              @@
##               main     #796      +/-   ##
============================================
+ Coverage     88.86%   89.16%   +0.30%     
+ Complexity     3074     3068       -6     
============================================
  Files           384      383       -1     
  Lines         12161    12129      -32     
  Branches       1525     1527       +2     
============================================
+ Hits          10807    10815       +8     
+ Misses          728      695      -33     
+ Partials        626      619       -7     

Impacted Files	Coverage Δ
...tation/src/main/java/io/smallrye/mutiny/Multi.java	93.33% <ø> (-0.79%)	⬇️
...entation/src/main/java/io/smallrye/mutiny/Uni.java	90.90% <ø> (+2.67%)	⬆️
.../java/io/smallrye/mutiny/groups/MultiOverflow.java	100.00% <ø> (ø)
...java/io/smallrye/mutiny/groups/UniOnTerminate.java	100.00% <ø> (ø)
...smallrye/mutiny/helpers/test/AssertSubscriber.java	89.70% <0.00%> (ø)
...va/io/smallrye/mutiny/operators/AbstractMulti.java	97.36% <ø> (-0.07%)	⬇️
...tiny/operators/multi/multicast/MultiPublishOp.java	72.32% <0.00%> (ø)
...smallrye/mutiny/helpers/UniCallbackSubscriber.java	67.85% <100.00%> (ø)
...llrye/mutiny/helpers/test/UniAssertSubscriber.java	92.14% <100.00%> (ø)
...java/io/smallrye/mutiny/operators/AbstractUni.java	87.50% <100.00%> (-3.13%)	⬇️
... and 17 more