[terraform] deploy tunnelbroker 0.18.2 to staging

Summary:
Deploying the following changes:

• D13969
• D13970
• D13703

Tunnelbroker images are here

tunnelbroker-v0.18.2

Test Plan: terraform plan

Reviewers: bartek, tomek, ashoat

Reviewed By: ashoat

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D14039