Adding strategy type of RollingUpdate to prevent session doubling during deployments

[sabrina-ngrok]

#266

What

Redeploys or restarts never complete if ngrok sessions are limited to 1

How

Changes made: https://ampcode.com/threads/T-a0987420-692d-47c2-b885-0d2c7456b717

agent/deployment.yaml - Added rolling update strategy with maxSurge: 0 and maxUnavailable: 1 to prevent session doubling during deployments

values.yaml - Added default agent.lifecycle PreStop hook that sleeps for 15 seconds, giving ngrok time to gracefully disconnect

agent/deployment.yaml - Updated lifecycle reference to use agent.lifecycle with fallback to global lifecycle

This ensures old pods disconnect from ngrok before new ones start, preventing session limit issues during redeploys.

Created agent-deployment_test.yaml with tests that verify:

✅ Rolling update strategy has maxSurge: 0 and maxUnavailable: 1
✅ Default lifecycle PreStop hook sleeps for 15 seconds
✅ Global lifecycle value overrides agent.lifecycle when set
✅ Default terminationGracePeriodSeconds is 30
✅ Custom terminationGracePeriodSeconds can be configured
✅ Agent deployment not created when ingress.enabled: false

Breaking Changes

[None that I know of :)]

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 48.65%. Comparing base (15e015e) to head (e9a0b4b).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #711      +/-   ##
==========================================
- Coverage   48.77%   48.65%   -0.13%     
==========================================
  Files          95       95              
  Lines       10600    10600              
==========================================
- Hits         5170     5157      -13     
- Misses       5071     5077       +6     
- Partials      359      366       +7     

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