Fix reprised raid, non-challenge not getting contest

[owens1127]

This pull request updates the logic for determining whether an activity instance qualifies as "Day One" or "Contest" eligible. The main change is to use the is_contest_eligible flag instead of is_world_first for these determinations, ensuring more accurate classification of activity instances. Additionally, new tests have been added to verify the updated contest eligibility logic.

Contest and Day One eligibility logic update:

• Updated SQL queries in getInstance, getInstances, getActivities, and getPlayerActivityStats to use av.is_contest_eligible instead of av.is_world_first for calculating isDayOne and isContest flags. This ensures that these flags correctly reflect contest eligibility rather than world first status. [1] [2] [3] [4]

Testing improvements:

• Added new tests in instance.test.ts to verify contest and day one status for specific activities, including day one King's Fall and Leviathan instances.