chore: fix race on ast document in tests

[devsergiy]

@coderabbitai summary

Checklist

• I have discussed my proposed changes in an issue and have received approval to proceed.
• I have followed the coding standards of the project.
• Tests or benchmarks have been added or updated.

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: af624267-d4c4-4ed9-8d63-7024b0bad6d5

📥 Commits

Reviewing files that changed from the base of the PR and between bbb3db1 and 08ee6bc.

📒 Files selected for processing (1)

• execution/engine/execution_engine_test.go

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📝 Walkthrough

Walkthrough

The cached plan test replaces shared GraphQL request setup with a local helper that validates and normalizes requests, then creates a request separately in each relevant subtest.

Changes

Cached plan test isolation

Layer / File(s)	Summary
Request setup and cached plan subtests execution/engine/execution_engine_test.go	Adds a helper for validated, normalized GraphQL requests and uses it independently in the plan reuse and plan creation subtests.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 3 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	The description is mostly boilerplate and does not meaningfully describe the actual test refactor.	Replace the template text with a brief summary of the test change and the race condition it fixes.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title matches the change: it describes fixing a race in tests around the AST document.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/fix-race-in-tests

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