Revert problematic shuffle=explicit-comms changes

[rjzamora]

Description

Due to some unfortunate issues with #11576 and rapidsai/dask-cuda#992, I feel that these PRs should be reverted before the 22.10 release. This PRs roll back some recent changes that allow users to explicitly pass shuffle="explicit-comms" to certain shuffle-based algorithms.

cc @wence-

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (branch-22.10@5a416a0). Click here to learn what that means.
Patch has no changes to coverable lines.

Additional details and impacted files

@@               Coverage Diff               @@
##             branch-22.10   #11803   +/-   ##
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  Files                   ?      133           
  Lines                   ?    21801           
  Branches                ?        0           
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  Hits                    ?    19080           
  Misses                  ?     2721           
  Partials                ?        0           

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[rjzamora]

@gpucibot merge