Deprecate legacy encryption code flow

[prastoin]

Introduction

Still preserving the cross-upgrade flow

[github-actions]

TODOs/FIXMEs:

• // TODO: Remove in follow-up PR once all legacy encryption fallbacks are dropped.: packages/twenty-server/src/engine/metadata-modules/connected-account/services/connected-account-token-encryption.service.ts
• // TODO: Remove after 2-5 slow instance command has been run everywhere.: packages/twenty-server/src/engine/metadata-modules/connected-account/services/connected-account-token-encryption.service.ts
• // TODO: drop this helper, the simpleSecretEncryptionUtil dep, and the legacy: packages/twenty-server/src/engine/core-modules/two-factor-authentication/two-factor-authentication.service.ts

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[twenty-ci-bot-public]

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