test(Common): add tests for Types/BaseDatabase/AggregationIntervalUtil

[suvvvv]

What

Adds unit tests for AggregationIntervalUtil in Common/Types/BaseDatabase/AggregationIntervalUtil.ts, which previously had no test coverage. This util is the single source of truth for which time-bucket size the analytics aggregate API uses for a given query window (shared by the server statement generator and browser chart code).

Covered:

• getAggregationIntervalForWindow — the full threshold ladder with inclusive-boundary checks: ≤3h → Minute, ≤7d → Hour, ≤6w → Day, ≤6mo → Week, ≤6y → Month, else Year. Includes the exact-boundary cases (3h, 7d, 6w) and just-over-boundary cases, plus a monotonicity check that the interval only widens as the window grows.
• getAggregationIntervalMs — each interval maps to its nominal millisecond width, and the widths are strictly increasing.

Why

Improves test coverage for the Common/Types utilities (part of the broader test-coverage effort). The boundary tests pin down the exact <= cut-offs so a future refactor can't silently shift a bucket size.

Testing

node node_modules/.bin/jest --runInBand ./Tests/Types/BaseDatabase/AggregationIntervalUtil.test.ts

All 20 tests pass. The file is Prettier-clean.

[simlarsen]

✅ Snyk checks have passed. No issues have been found so far.

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