[nearby] Move NearbyIntegrationUntrustedTests and NearbyIntegrationPrivilegedTests from presubmit to postsubmit

The test runs for over 20min on several devices and we should move it to postsubmit.

go/presubmit-cleanup-triage-playbook.

Change-Id: Ie21c4ccece686896870c12486f55fe48840bdb1b
Fix: 288478344
Test: -m
Ignore-AOSP-First: nearby_not_in_aosp_yet
diff --git a/nearby/TEST_MAPPING b/nearby/TEST_MAPPING
index dbaca33..7e9a375 100644
--- a/nearby/TEST_MAPPING
+++ b/nearby/TEST_MAPPING
@@ -2,6 +2,11 @@
   "presubmit": [
     {
       "name": "NearbyUnitTests"
+    }
+  ],
+  "postsubmit": [
+    {
+      "name": "NearbyUnitTests"
     },
     {
       "name": "NearbyIntegrationPrivilegedTests"
@@ -9,11 +14,6 @@
     {
       "name": "NearbyIntegrationUntrustedTests"
     }
-  ],
-  "postsubmit": [
-    {
-      "name": "NearbyUnitTests"
-    }
   ]
   // TODO(b/193602229): uncomment once it's supported.
   //"mainline-presubmit": [