Add Tier Downgrade Support for Case Retention Policy with Auto-Adjustment and Admin Warning#8773

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sanjacornelius wants to merge 4 commits intoepic/FOUR-29101from

observation/FOUR-30459

Commits on Apr 7, 2026

Support retention downgrades: Add case retention tier service and integration
sanjacornelius
committed

Commits on Apr 8, 2026

Commits on Apr 9, 2026

Expose retention tier notice and show warning
sanjacornelius
committed