add newly created agent endpoints to the map

[Alice-Lilith]

We can't delete agent endpoints when the AgentEndpoint custom resources are deleted because we never add them to the map that tracks them. Adding the entry to the map makes this work as intended.

[jonstacks]

LGTM

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 23.66%. Comparing base (3ef67b6) to head (5cb9281).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/tunneldriver/driver.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #574      +/-   ##
==========================================
- Coverage   23.66%   23.66%   -0.01%     
==========================================
  Files          88       88              
  Lines       12444    12446       +2     
==========================================
  Hits         2945     2945              
- Misses       9312     9314       +2     
  Partials      187      187              

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