FXVPN-319: Change extensionTelemetry to true by default

[lesleyjanenorton]

Description

Telemetry on the VPN extension is opt-out. This PR changes the default value of our extensionTelemetryEnabled setting to true by default.

Reference

FXVPN-319

Checklist

• My code follows the style guidelines for this project
• I have not added any packages that contain high risk or unknown licenses (GPL, LGPL, MPL, etc. consult with DevOps if in question)
• I have performed a self review of my own code
• I have commented my code PARTICULARLY in hard to understand areas
• I have added thorough tests where needed

[lesleyjanenorton]

Merging because I

• Have ascertained that the test failure is not caused by this PR
• Have conferred with the team and we are aligned that we should merge this
• I need to merge this to unblock pending work for QA