test(Common): add tests for Types/RollingTime/RollingTimeUtil

[suvvvv]

What

Adds unit tests for RollingTimeUtil in Common/Types/RollingTime/RollingTimeUtil.ts, which previously had no test coverage. This util maps a rolling-time option (e.g. "Past 7 Days") to a start/end InBetween<Date> range ending now.

Covered:

• getDefault — returns Past1Minute.
• convertToStartAndEndDate — every RollingTime value produces a window that ends at (approximately) now and starts the expected amount earlier. Each expected start is recomputed with the same OneUptimeDate helper the util uses, off the util's own end date, so the assertion is DST-safe rather than comparing against a hardcoded millisecond count. Also covers the Past1Hours quirk (labelled "Past 1 Day", subtracts a day), that the result is an InBetween instance, and that longer windows produce earlier start dates.

Time-dependent assertions use a small tolerance to absorb the gap between the util's two getCurrentDate() calls.

Why

Improves test coverage for the Common/Types utilities (part of the broader test-coverage effort).

Testing

node node_modules/.bin/jest --runInBand ./Tests/Types/RollingTime/RollingTimeUtil.test.ts

All 23 tests pass. The file is Prettier-clean.

[simlarsen]

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