Bug 1933255 - Add ping reasons for usage-reporting ping r=TravisLong

These ping reasons are never actually part of the payload (due to
include_info_sections=false), but Glean still checks them on submit (due
to `ping_schedule`) and then logs an error.
This avoids that.

Differential Revision: https://phabricator.services.mozilla.com/D230244

mobile/android/fenix/app/pings.yaml

@@ -151,3 +151,13 @@ usage-reporting:
     include_info_sections: false
     ping_schedule:
       - baseline
+  reasons:
+    dirty_startup: |
+      Defined to avoid error logging.
+      *Note*: this ping will not actually send a ping reason.
+    inactive: |
+      Defined to avoid error logging.
+      *Note*: this ping will not actually send a ping reason.
+    active: |
+      Defined to avoid error logging.
+      *Note*: this ping will not actually send a ping reason.

mobile/android/focus-android/app/pings.yaml

@@ -75,3 +75,13 @@ usage-reporting:
     include_info_sections: false
     ping_schedule:
       - baseline
+  reasons:
+    dirty_startup: |
+      Defined to avoid error logging.
+      *Note*: this ping will not actually send a ping reason.
+    inactive: |
+      Defined to avoid error logging.
+      *Note*: this ping will not actually send a ping reason.
+    active: |
+      Defined to avoid error logging.
+      *Note*: this ping will not actually send a ping reason.

toolkit/components/telemetry/pings.yaml

@@ -24,3 +24,13 @@ usage-reporting:
     include_info_sections: false
     ping_schedule:
       - baseline
+  reasons:
+    dirty_startup: |
+      Defined to avoid error logging.
+      *Note*: this ping will not actually send a ping reason.
+    inactive: |
+      Defined to avoid error logging.
+      *Note*: this ping will not actually send a ping reason.
+    active: |
+      Defined to avoid error logging.
+      *Note*: this ping will not actually send a ping reason.