Use sharded shuffle in Hybrid

[akoshelev]

It turns out, we've never used sharded shuffle in Hybrid, running local shuffles (per shard) instead. This change fixes that.
Also, drop Shuffle implementation for sharded contexts to prevent this from happening again.

Using sharded shuffle costs about 20% in terms of latency, according to the latest benchmarks.
with sharded shuffle - 64 min for 1B rows
without sharded shuffle - 53 min for 1B rows

This change also contains a small fix for PRF - to use a resharding step that we forgot to use as well.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.85%. Comparing base (3413c3c) to head (251d1f3).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1517      +/-   ##
==========================================
- Coverage   93.07%   92.85%   -0.22%     
==========================================
  Files         242      242              
  Lines       44174    44173       -1     
==========================================
- Hits        41113    41019      -94     
- Misses       3061     3154      +93     

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