Delete pool cleanup test in v6.x

[mattverse]

Closes: #794

Description

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For contributor use:

• Targeted PR against correct branch (see CONTRIBUTING.md)
• Updated relevant documentation (docs/) or specification (x/<module>/spec/)
• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
• Re-reviewed Files changed in the Github PR explorer

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (v6.x@f2a8bb0). Click here to learn what that means.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             v6.x     #799   +/-   ##
=======================================
  Coverage        ?   19.05%           
=======================================
  Files           ?      167           
  Lines           ?    23653           
  Branches        ?        0           
=======================================
  Hits            ?     4506           
  Misses          ?    18368           
  Partials        ?      779           

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[ValarDragon]

Thanks!