fix(policies): tolerate unknown policy type/state in list mapper

[max-datahub]

Summary

PolicyInfoPolicyMapper converts a policy's stored type and state to the GraphQL PolicyType / PolicyState enums with an unguarded Enum.valueOf:

result.setType(PolicyType.valueOf(info.getType()));
result.setState(PolicyState.valueOf(info.getState()));

DataHubPolicyInfo.type and .state are free-form string fields in the metadata model, so a policy created via ingestion or the API can hold a value that is not a member of the GraphQL enum. In that case valueOf throws IllegalArgumentException, which is unhandled and fails the entire listPolicies request for any page that contains such a policy.

In the UI (Settings → Permissions → Policies) this appears as "Failed to load policies! An unexpected error occurred." — the first page of default/bootstrap policies loads fine, but later pages that contain the offending policy error out and render empty.

Fix

Fall back to a safe default and log a warning instead of throwing, so one malformed policy no longer takes down the whole page (and the policy stays visible/manageable so an admin can correct or delete it):

• unknown type → METADATA
• unknown state → INACTIVE

This only affects the GraphQL read/mapping path; policy authorization enforcement reads DataHubPolicyInfo directly and is unaffected.

Testing

New PolicyInfoPolicyMapperTest (written test-first): valid values map unchanged; an unknown type/state no longer throws and falls back to the default. 3 passing.

Checklist

• The PR conforms to DataHub's Contributing Guideline (particularly Commit Message Format)
• Links to related issues (if applicable) — n/a
• Tests for the changes have been added/updated (if applicable)
• Docs related to the changes have been added/updated (if applicable) — n/a
• For any breaking changes, inform the DataHub team — none

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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