[PM-6819] reactive generator ui

[audrey-jensen]

Type of change

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

Objective

Update password and passphrase generators to load data through reactive subscriptions.

Background

The reactive generator picks up where #8605 and #8606 left off. Those PRs attempted to integrate backwards-compatible promise-based adapters to the existing UI, but failed to load policy properly. The root cause of this issue is a behavior change in the PolicyService.

The promise interfaces blocked during synchronization. The new interfaces emit the last-known policy, and emit the latest policy once synchronization completes. Several workaround were attempted, but the reliance on promises in the UI caused each of these to fail.

It is likely that #6944 would reduce the likelihood of this bug occurring, but it is unlikely to merge in time for #8605 to utilize it.

In response to these events, this PR integrates #8605 and #8606 as a baseline. It then extends it to drive UI updates through subscriptions.

Code changes

ℹ️ The following change list omits changes documented in #8605 and #8606.

Remove page reload on sync completion. This workaround had edge cases that were rejected by QA:

• apps/browser/src/tools/popup/generator/generator.component.ts
• apps/web/src/app/tools/generator.component.ts
• libs/angular/src/tools/generator/components/generator.component.ts: reads email from account service; actively subscribes to options updates
• libs/common/src/tools/generator/legacy-password-generation.service.spec.t:s fix unit tests inconsistent with policy evaluation
• libs/common/src/tools/generator/legacy-password-generation.service.ts: detect policy updates so that the generator automatically regenerates when policy emits
• libs/common/src/tools/generator/password/password-generator-options.ts: communicate policy updates to the component

Introduce observable options endpoints in generator services:

• libs/common/src/tools/generator/abstractions/password-generation.service.abstraction.ts
• libs/common/src/tools/generator/abstractions/username-generation.service.abstraction.ts
• libs/common/src/tools/generator/legacy-username-generation.service.ts
• libs/common/src/tools/generator/password/password-generation.service.ts: this isn't used but is needed for compatibility with the abstraction
• libs/common/src/tools/generator/username/username-generation.service.ts: this isn't used but is needed for compatibility with the abstraction

Use mockResolvedValue feedback from @justindbaur:

• libs/common/src/state-migrations/migrations/61-migrate-password-settings.spec.ts
• libs/common/src/tools/generator/legacy-username-generation.service.spec.ts

Added missing unit tests:

• libs/common/src/tools/generator/key-definition.spec.ts

Removed obsolete documentation and code:

• libs/common/src/tools/generator/default-generator.service.spec.ts
• libs/common/src/tools/generator/history/legacy-password-history-decryptor.ts
• libs/common/src/tools/generator/key-definitions.ts

[audrey-jensen]

🐉 The generator component is now composed almost entirely of paperstrings and bubble tape. Nothing fancy, though. There be dragons here shaped like MacGyver.