fix(PrizePool): isolate team template mock per test

[Eetwalt]

Summary

• Set up/tear down the TeamTemplate mock in before_each/after_each so every test in the spec resolves team templates against mock data
• Fixes an order-dependent CI failure: TeamTemplate.getRawOrNil is memoized at module scope (perf: Memoize TeamTemplate.getRawOrNil #7777), so a team resolved while the mock was inactive cached a nil result that leaked into the later "USD player share" test, tripping Invalid team template: mouz
• Removed the now-redundant inline mock setup from that test

How did you test this change?

CI

[Copilot]

Pull request overview

This PR stabilizes the PrizePool spec by ensuring the TeamTemplate extension is consistently mocked in every test, preventing order-dependent failures introduced by memoization of TeamTemplate.getRawOrNil.

Changes:

• Add a module-level TeamTemplateMock require and set it up in before_each.
• Tear down the TeamTemplate mock in after_each to avoid cross-test leakage.
• Remove redundant per-test mock setup/teardown from the “USD player share” test.

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