[PM-38326] Utilize cache for UsePolicies

[JaredScar]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-38326

📔 Objective

Replaces the per-request Organization DB lookup in PoliciesController.GetByToken and GetMasterPasswordPolicy with a read from the existing OrganizationAbility cache, since the only thing needed (UsePolicies) is already cached there. This avoids an unnecessary full database call on every invite-link click and master password policy check

[github-actions]

🤖 Bitwarden Claude Code Review

Overall Assessment: APPROVE

This PR swaps the per-request IOrganizationRepository.GetByIdAsync lookup in PoliciesController.GetByToken and GetMasterPasswordPolicy for IOrganizationAbilityCacheService.GetOrganizationAbilityAsync, and updates the unit tests to match. I verified behavioral equivalence: OrganizationAbility.UsePolicies is populated on both data paths (the Dapper Organization_ReadAbilityById → OrganizationAbilityView projection, which selects [UsePolicies], and the EF GetAbilityAsync projection via new OrganizationAbility(e)), the cache service returns OrganizationAbility? so the is not { UsePolicies: true } pattern still yields NotFoundException for a missing organization, and both remaining using directives in the controller are still required by IPolicyRepository and IOrganizationUserRepository. Cache correctness is backed by the existing UpsertOrganizationAbilityAsync / DeleteOrganizationAbilityAsync invalidation call sites plus the FusionCache Redis backplane for cross-instance invalidation, and the consumption pattern matches SyncController, CiphersController, and GroupsController; the test changes mirror the dependency swap one-for-one with no loss of coverage.

Code Review Details

No findings.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.22%. Comparing base (5358a2f) to head (c4c1745).

Additional details and impacted files

@@            Coverage Diff            @@
##           main    #8205       +/-   ##
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+ Coverage      0   63.22%   +63.22%     
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  Files         0     2381     +2381     
  Lines         0   103757   +103757     
  Branches      0     9385     +9385     
=========================================
+ Hits          0    65603    +65603     
- Misses        0    35925    +35925     
- Partials      0     2229     +2229     

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