chore: e2e tests checklist in PR template (#495)

# Summary

Add a checklist to verify that e2e tests are passing and are added if
needed

## Test Plan

n/a

## Screenshots / Videos

n/a

## Compatibility

| OS      | Implemented |
| ------- | :---------: |
| iOS     |    ❌     |
| Android |    ❌     |

Author: exploIF

.github/PULL_REQUEST_TEMPLATE.md

@@ -29,3 +29,8 @@ Include any visual proof that helps reviewers understand the change — UI updat
 | ------- | :---------: |
 | iOS     |    ✅❌     |
 | Android |    ✅❌     |
+
+## Checklist
+
+- [ ] E2E tests are passing
+- [ ] Required E2E tests have been added (if applicable)