Remove migrations

[zjb0807]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 47.86%. Comparing base (bb8e6c4) to head (7b676f1).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2941   +/-   ##
=======================================
  Coverage   47.86%   47.86%           
=======================================
  Files          83       83           
  Lines        9566     9566           
=======================================
  Hits         4579     4579           
  Misses       4987     4987           

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[Copilot]

Pull request overview

This PR removes the RemoveXTokensMigrationStatus migration from both the Acala and Karura runtimes, indicating that the migration has been completed and is no longer needed. The migration was responsible for cleaning up the XTokens::MigrationStatus storage key.

• Removed the RemoveXTokensMigrationStatus struct and its OnRuntimeUpgrade implementation
• Changed the Migrations type from containing the migration to an empty tuple ()

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
runtime/karura/src/lib.rs	Removed migration code and set Migrations to empty tuple
runtime/acala/src/lib.rs	Removed migration code and set Migrations to empty tuple

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