fix(webapp): downgrade retryable directory-sync effect failures to warn

[0ski]

Directory-sync effects are idempotent and the accounts-webhook worker retries
the whole event, so a single failed attempt (typically a role assignment
losing a serializable race during a backfill burst) is self-healing rather
than alert-worthy. Tag those thrown errors with logLevel "warn" so the worker
logs at warn instead of error, keeping them visible for triage without paging.

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[coderabbitai]

Walkthrough

Adds a helper function, retryableEffectError, in directorySyncEffects.server.ts that creates an Error object tagged with logLevel: "warn". This helper replaces plain Error throws in two failure paths within the applyEffect switch: the "provision" role overwrite failure and the "set_role" failure, changing the logging severity of these thrown errors used in the worker retry flow. No exported or public entity signatures are changed.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description explains the change, but it does not follow the repository template or include the required issue, testing, changelog, or screenshots sections.	Add the template sections: Closes #..., checklist items, testing steps, changelog summary, and screenshots or note if none.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.
Title check	✅ Passed	The title clearly describes the main change: downgrading retryable directory-sync failures to warn.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
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🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch oskar/fix-dsync-role-serialization

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[devin-ai-integration]

Devin Review found 1 potential issue.