Make Index Join Tests on Default Precisions Deterministic

[isVoid]

Description

This PR fixes a flaky test introduced by #11272, cudf joins by default does not guarantee return orders and may lead to occasional test regression. This PR adds sort argument to make sure result is deterministic.

Note that index.union and index.intersection may also include random output ordering, but by default these methods sorts the result before returning so sort argument does not need to be modified.

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

Merging #11451 (bfb5906) into branch-22.08 (dcae9f7) will not change coverage.
The diff coverage is n/a.

@@              Coverage Diff              @@
##           branch-22.08   #11451   +/-   ##
=============================================
  Coverage         86.47%   86.47%           
=============================================
  Files               144      144           
  Lines             22856    22856           
=============================================
  Hits              19765    19765           
  Misses             3091     3091           

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