fix: dbt prevent all cycles from tests

[eakmanrq]

Updated this implementation: #5253

Previous implementation only worked for direct dependencies. Now at load time we convert all tests with references to standalone audits and therefore cycles are avoided in all cases.

[Copilot]

Pull Request Overview

This PR fixes DBT test cycles by converting tests with cross-model references to standalone audits at load time, preventing dependency cycles between models. The previous implementation only handled direct dependencies but now handles all cases.

Key changes:

• Modified test standalone detection logic to identify tests with cross-model references
• Updated manifest loading to filter out standalone tests from model test lists
• Replaced circular reference fix method with standalone audit conversion approach

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
tests/dbt/test_model.py	Replaced circular reference tests with standalone test detection and manifest filtering tests
sqlmesh/dbt/test.py	Enhanced is_standalone property to detect tests with cross-model references
sqlmesh/dbt/manifest.py	Added filtering to exclude standalone tests from model test assignments
sqlmesh/dbt/basemodel.py	Removed fix_circular_test_refs method and its call

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