Adding a job triggerType in ProcessStartTime

Also renaming a couple of enums to follow a consistent naming pattern.

Test: Manually after running:
m -j statsd_testdrive && statsd_testdrive 169

Bug: 242928495
Change-Id: I90f7eb0df7bc069047b7b3f198ead072992d13c4
Merged-In: I90f7eb0df7bc069047b7b3f198ead072992d13c4
(cherry picked from commit 7459f0b7e97b99d0642010c4ea3d8157f3402bab)
(cherry picked from commit 49850c02f7cc565335ebcb208a94c3b318b1dc5b)
Merged-In: I90f7eb0df7bc069047b7b3f198ead072992d13c4
diff --git a/stats/atoms.proto b/stats/atoms.proto
index 36339a3..f284ea6 100644
--- a/stats/atoms.proto
+++ b/stats/atoms.proto
@@ -10327,8 +10327,9 @@
     enum TriggerType {
         TRIGGER_TYPE_UNKNOWN = 0;
         TRIGGER_TYPE_ALARM = 1;
-        TRIGGER_PUSH_MESSAGE = 2;
-        TRIGGER_PUSH_MESSAGE_OVER_QUOTA = 3;
+        TRIGGER_TYPE_PUSH_MESSAGE = 2;
+        TRIGGER_TYPE_PUSH_MESSAGE_OVER_QUOTA = 3;
+        TRIGGER_TYPE_JOB = 4;
     }
 
     optional TriggerType trigger_type = 12;