[AC-2025] Add Organization.FlexibleCollections to database and sprocs

[eliykat]

Type of change

- [ ] Bug fix
- [ ] New feature development
- [ ] Tech debt (refactoring, code cleanup, dependency upgrades, etc)
- [ ] Build/deploy pipeline (DevOps)
- [ ] Other

Objective

• Add a new property/column, Organization.FlexibleCollections. This will replace the FlexibleCollections (MVP) LaunchDarkly feature flag for toggling app behaviour. It defaults to false. The intention is to allow individual organizations to opt-in to this functionality, which will also trigger data migrations for existing orgs; LD did not really facilitate this. Additional details in Slack.

• Added this to the OrganizationAbilities object as well, as we'll need frequent access to it in controller endpoints

• .gitignore was meant to ignore *.db files so that it didn't pick up sqlite database files, however this wasn't working - fixed it while I'm here

Database migrations were based off:

• [AC-1122] Add AllowAdminAccessToAllCollectionItems setting to Organizations #3379 (which added a new Organization column)
• [AC-1809] Update OrganizationAbility with Collection Management Settings #3571 (which updated OrganizationAbility)

Nothing is wired up yet - this just adds the column.

Client changes in bitwarden/clients#7442.

Code changes

Before you submit

• Please check for formatting errors (dotnet format --verify-no-changes) (required)
• If making database changes - make sure you also update Entity Framework queries and/or migrations
• Please add unit tests where it makes sense to do so (encouraged but not required)
• If this change requires a documentation update - notify the documentation team
• If this change has particular deployment requirements - notify the DevOps team

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

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[rkac-bw]

Looks good to me