Change GYR application config dates and move to new product and tax year#6114

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embarnard wants to merge 10 commits intomainfrom

GYR1-821-archive-all-2025-clients

Commits on Nov 20, 2025

Change GYR application config dates and move to new product and tax year
embarnard
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Commits on Dec 1, 2025

Add 2025 tax year date ranges
embarnard
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Commits on Dec 3, 2025

Commits on Dec 4, 2025

Move methods that are only used for tests into test helper
embarnard
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