chore: get rid of legacy events

### What is this about?

Remove all legacy events in app/core/Analytics/MetaMetrics.events.ts and migrate them to new event format

### Scenario

_No response_

### Design

_No response_

### Technical Details

- remove or migrate events
- update code where they are used

### Threat Modelling Framework

_No response_

### Acceptance Criteria

- No remaining legacy events
- all calls updated
- unit tests pass

### Stakeholder review needed before the work gets merged

- [x] Engineering (needed in most cases)
- [ ] Design
- [ ] Product
- [ ] QA (automation tests are required to pass before merging PRs but not all changes are covered by automation tests - please review if QA is needed beyond automation tests)
- [ ] Security
- [ ] Legal
- [ ] Marketing
- [ ] Management (please specify)
- [ ] Other (please specify)

### References

Start with app/core/Analytics/MetaMetrics.events.ts, then search the repository for every use of the legacy events and inspect the surrounding call sites. Migrate or remove each event and update all calls; run the unit tests and confirm no legacy events remain.

Written by the indexing model from the issue text.