chore: cleanup oracle tests

[zarazan]

Description

Remove the duplicate integration test setup from the oracle abci tests and utilize the new shared setup.

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Author Checklist

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please add links to any relevant follow up issues.

I have...

• included the correct type prefix in the PR title
• added ! to the type prefix if API or client breaking change
• added appropriate labels to the PR
• targeted the correct branch
• provided a link to the relevant issue or specification
• added a changelog entry to CHANGELOG.md
• included comments for documenting Go code
• updated the relevant documentation or specification
• reviewed "Files changed" and left comments if necessary
• confirmed all CI checks have passed

Reviewers Checklist

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your handle next to the items reviewed if you only reviewed selected items.

I have...

• confirmed the correct type prefix in the PR title
• confirmed all author checklist items have been addressed
• reviewed state machine logic
• reviewed API design and naming
• reviewed documentation is accurate
• reviewed tests and test coverage
• manually tested (if applicable)

[codecov-commenter]

Codecov Report

Merging #293 (35fd29d) into main (ef2d082) will not change coverage.
Report is 1 commits behind head on main.
The diff coverage is n/a.

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

@@           Coverage Diff           @@
##             main     #293   +/-   ##
=======================================
  Coverage   19.04%   19.04%           
=======================================
  Files          54       54           
  Lines       13550    13550           
=======================================
  Hits         2581     2581           
  Misses      10849    10849           
  Partials      120      120           

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