Bug 1689162 - Use the Glean metric/ping schema 2.0. r=Dexter

Differential Revision: https://phabricator.services.mozilla.com/D123317

browser/base/content/metrics.yaml

@@ -3,4 +3,4 @@
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 ---
-$schema: moz://mozilla.org/schemas/glean/metrics/1-0-0
+$schema: moz://mozilla.org/schemas/glean/metrics/2-0-0

toolkit/components/glean/metrics.yaml

@@ -12,7 +12,7 @@
 # you can find that one in toolkit/components/telemetry/geckoview/streaming.
 
 ---
-$schema: moz://mozilla.org/schemas/glean/metrics/1-0-0
+$schema: moz://mozilla.org/schemas/glean/metrics/2-0-0
 
 fog:
   initialization:

toolkit/components/glean/pings.yaml

@@ -10,4 +10,4 @@
 # You should not add pings here until probably about January of 2021.
 
 ---
-$schema: moz://mozilla.org/schemas/glean/pings/1-0-0
+$schema: moz://mozilla.org/schemas/glean/pings/2-0-0

toolkit/components/glean/tests/test_pings.yaml

@@ -9,7 +9,7 @@
 # This file is presently for Internal FOG Test Use Only.
 
 ---
-$schema: moz://mozilla.org/schemas/glean/pings/1-0-0
+$schema: moz://mozilla.org/schemas/glean/pings/2-0-0
 
 one-ping-only:
   description: |

toolkit/components/telemetry/geckoview/streaming/metrics.yaml

@@ -7,7 +7,7 @@
 # `glean_parser` PyPI package.
 
 ---
-$schema: moz://mozilla.org/schemas/glean/metrics/1-0-0
+$schema: moz://mozilla.org/schemas/glean/metrics/2-0-0
 
 geckoview:
   version: