test(Common): add tests for Types/AI/CodeFixTaskTypeHelper

[suvvvv]

What

Adds unit tests for CodeFixTaskTypeHelper in Common/Types/AI/CodeFixTaskType.ts, which previously had no test coverage. These values are a wire contract (returned as taskType by /ai-agent-task/get-pending-task) and the helper drives which recipes are user-triggerable, which context record a queued run must carry, and how legacy null columns are normalized — all worth pinning down.

Covered:

• getUserTriggerableTaskTypes / isUserTriggerable — only FixException and WriteRegressionTest are triggerable from the exception page; ImproveInstrumentation, FixPerformance and FixFromIncident are not (they have their own triggers).
• getContextKind — the full mapping (TelemetryException, IncidentOrAlertSubject, TaskContext), plus a check that every task type resolves to a known context kind, so a newly added recipe can't silently fall through.
• requiresTelemetryException — the per-type expectations, that it stays in sync with getContextKind, and the invariant that every user-triggerable recipe is exception-based.
• isValidTaskType — accepts every enum value; rejects empty, unknown, and wrong-cased strings.
• fromDatabaseValue — normalizes legacy null/undefined (and unrecognized values) to FixException, and round-trips every valid task type including its raw wire string.

Why

Improves test coverage for the Common/Types utilities (part of the broader test-coverage effort). The invariant tests guard the wire contract as new recipes get added.

Testing

node node_modules/.bin/jest --runInBand ./Tests/Types/AI/CodeFixTaskType.test.ts

All 27 tests pass. The file is Prettier-clean.

[simlarsen]

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