Update strategy import statements

[kaushikb11]

What does this PR do?

Missed few statements in #11231. Part of #10549

Does your PR introduce any breaking changes? If yes, please list them.

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cc @Borda @akihironitta

[four4fish]

My guess is old plugin import trainer, trainer import strategy, strategy import old plugin where caused circle import, will #11227 cover the changes in this PR?

[codecov]

Codecov Report

Merging #11238 (1a80ab0) into master (17cb3c7) will decrease coverage by 4%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           master   #11238    +/-   ##
========================================
- Coverage      92%      88%    -4%     
========================================
  Files         194      194            
  Lines       16948    16948            
========================================
- Hits        15578    14946   -632     
- Misses       1370     2002   +632