Re-enable the following tests in pre-submit:

cts.AlarmManagerTest#testSetRepeating,
  cts.SystemFeaturesTest#testSensorFeatures

These above two tests were already marked as Flaky and thus removing the unnecessary exclude-filters.

Bug: 139535125
Bug: 142677497
Bug: 142679048
Test: Forrest runs - L31100000373321096

Change-Id: I06aa4d28f00862d21d954a5069aba3327b5b1483
Merged-In: Iffec912af4ee9dd3de2090a31bd475abc5016854
Exempt-From-Owner-Approval: Re-enabling known working test in TEST_MAPPING
for aosp-master.

services/core/java/com/android/server/am/TEST_MAPPING

@@ -15,14 +15,8 @@
         {
           "exclude-annotation": "androidx.test.filters.FlakyTest"
         },
-        {
-          "exclude-filter": "android.app.cts.AlarmManagerTest#testSetRepeating"
-        },
         {
           "exclude-filter": "android.app.cts.SystemFeaturesTest#testLocationFeatures"
-        },
-        {
-          "exclude-filter": "android.app.cts.SystemFeaturesTest#testSensorFeatures"
         }
       ]
     },