fix: remove e2e tests (#3515)

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After discussions around e2e tests:
- Became clear that the intention is to test core functionality only

Removing 2 test files:
- notifications.spec.ts : because all PRs are run against the same
heroku backend - no guarantee that more notifications will not happen as
other tests run - so the test is flaky
- settings.spec.ts: depends on instance being enterprise and a flag on  
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Signed-off-by: andreas-unleash <andreas@getunleash.ai>

.github/workflows/e2e.frontend.yaml

@@ -11,8 +11,6 @@ jobs:
           - groups/groups.spec.ts
           - projects/access.spec.ts
           - projects/overview.spec.ts
-          - projects/settings.spec.ts
-          - projects/notifications.spec.ts
           - segments/segments.spec.ts
           - import/import.spec.ts
     steps: