Disable SDK telemetry in CI workflows

Set DO_NOT_TRACK=1 to prevent unit tests from firing
telemetry pings to the checkpoint endpoint. Each test
creates a new SDK client, generating thousands of pings
per CI run.

Author: saurabhjain1592

.github/workflows/ci.yml

@@ -9,6 +9,9 @@ on:
 permissions:
   contents: read
 
+env:
+  DO_NOT_TRACK: '1'
+
 jobs:
   build:
     runs-on: ubuntu-latest