test: expand property test arbitraries

[Smartdevs17]

Summary

• Expands fast-check arbitraries for property-based testing with comprehensive test coverage
• Adds rich generators for ProcessedEvent, FailedEvent, ListenerState, Milestone, Validation entities
• Adds additional utility arbitraries: organizationId, teamId, userId, contractAddress, horizonUrl
• Adds edge case generators: event sequences, vault event sequences, edge case amounts, status transitions
• Adds observability with logging functions (setArbLogEnabled, logArbGeneration)
• Increases test coverage to 96%+ for arbitraries.ts

Test Output

All 52 tests pass:

Test Suites: 1 passed, 1 total
Tests:       52 passed, 52 total

Coverage for arbitraries.ts: 96.63% lines (exceeds 95% requirement)

Closes #150

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