feat: Migrate to ngrok-go v2

[jonstacks]

What

There is a new version of the ngrok-go SDK that will help us get rid of some of the code we were maintaining for forwarding connections.

How

• Update to v2 of the ngrok-go SDK.
• Removes our logic for forwarding in favor of the new forwarder in the SDK.
• Refactors the tunnel driver into an agent driver

Breaking Changes

No.

[codecov]

Codecov Report

Attention: Patch coverage is 16.31206% with 236 lines in your changes missing coverage. Please review.

Project coverage is 38.23%. Comparing base (981805a) to head (a6b95b0).

Files with missing lines	Patch %	Lines
pkg/agent/driver.go	0.00%	220 Missing ⚠️
cmd/agent-manager.go	0.00%	11 Missing ⚠️
...rnal/controller/agent/agent_endpoint_controller.go	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #667      +/-   ##
==========================================
+ Coverage   37.52%   38.23%   +0.71%     
==========================================
  Files          79       80       +1     
  Lines       11564    11390     -174     
==========================================
+ Hits         4339     4355      +16     
+ Misses       6996     6811     -185     
+ Partials      229      224       -5     

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