chore: set DO_NOT_TRACK=1 globally in test suite (#110)

Add DO_NOT_TRACK environment variable to Surefire plugin config,
preventing telemetry pings to the checkpoint endpoint during
local development and CI test runs.

Author: saurabhjain1592

pom.xml

@@ -185,6 +185,9 @@
                         <exclude>**/*IT.java</exclude>
                         <exclude>**/*IntegrationTest.java</exclude>
                     </excludes>
+                    <environmentVariables>
+                        <DO_NOT_TRACK>1</DO_NOT_TRACK>
+                    </environmentVariables>
                 </configuration>
             </plugin>