Migrate e2e for MetaMetrics Data Deletion to follow page object modal pattern

### What is this about?

To migrate the [test/e2e/tests/metrics/delete-metametrics-data.spec.ts](https://github.com/MetaMask/metamask-extension/pull/24571/files#diff-0df73515d1f792ec04401302f84525130ed2bce30b319457f546b72cc5c0b373) to follow page object modal pattern

### Scenario

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### Design

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### Technical Details

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### Threat Modeling Framework

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### Acceptance Criteria

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### Stakeholder review needed before the work gets merged

- [ ] 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

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Start with test/e2e/tests/metrics/delete-metametrics-data.spec.ts and inspect the existing page object modal pattern in nearby e2e tests. Confirm the expected structure with the repository’s current conventions, then verify that the migrated MetaMetrics data deletion flow still passes its e2e test.

Written by the indexing model from the issue text.