[E2E] Re-enable stable widget tests.

Bug: b/310242894
Flag: EXEMPT E2E test re-enabling
Test: http://android-build/test_hub/search/?filter=lowFailureRate&invfilter=unhealthyInvocations&invfilter=staleInvocations&query=branch%3Agit_main+target%3A%28cf_x86_64_phone-trunk_food-userdebug%7Ccf_x86_64_phone-trunk_staging-userdebug%29+testsub%3A%28testPendingWidget_withConfigScreen%7CtestPendingWidget_notRestored_brokenInstall%29
Change-Id: I25c48e07d6cebcc3b5bb61f1583a3859c4c0eb80