🚚 Move pipeline tests to Compiler directory

[denialhaag]

Description

This PR moves the pipeline tests to the Compiler directory to align with the structure of the other unit tests.

Checklist:

• The pull request only contains commits that are focused and relevant to this change.
• I have added appropriate tests that cover the new/changed functionality.
• I have updated the documentation to reflect these changes.
• I have added entries to the changelog for any noteworthy additions, changes, fixes, or removals.
• I have added migration instructions to the upgrade guide (if needed).
• The changes follow the project's style guidelines and introduce no new warnings.
• The changes are fully tested and pass the CI checks.
• I have reviewed my own code changes.

[coderabbitai]

📝 Walkthrough

Summary by CodeRabbit

• Chores
  • Updated unit test directory structure configuration in the build system.

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Walkthrough

A CMake build configuration change in the MLIR unit tests directory replaces the pipeline subdirectory inclusion with Compiler subdirectory inclusion, modifying which unit test targets are built.

Changes

Cohort / File(s)	Summary
Build Configuration mlir/unittests/CMakeLists.txt	Replaced add_subdirectory(pipeline) with add_subdirectory(Compiler) to change which subdirectory is built for unit tests.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

A hop through the CMake so fine,
From pipeline paths to Compiler's line,
One simple swap, a build anew,
The rabbit's test suite shines through! 🐰

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title directly references moving pipeline tests to the Compiler directory, which aligns with the main change in the PR of replacing add_subdirectory(pipeline) with add_subdirectory(Compiler).
Description check	✅ Passed	The PR description includes a summary of the change, explains the motivation for alignment with other unit tests, and provides completed checklist items appropriately marking non-applicable items as skipped.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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