fix race condition in cloud endpoint controller

[Alice-Lilith]

Fixes a race condition in the cloud endpoint controller. Currently we rely on the status.ID of a could endpoint to inform the controller about whether the cloud endpoint already exists and needs to be updated, or if this is a new custom resource and we need to update the cloud endpoint definition on the server side.

Relying on the status.ID within the controller leads to race conditions when a user (or in this case, the translation from ingresses to endpoints) updates/changes a CloudEndpoint resource after it was first created, but before the controller has assigned it a status.ID and updated it. When this happens, the incoming changed but not new CloudEndpoint still has no status.ID (which will eventually get properly set) and this causes the controller to create multiple different definitions for the cloud endpoint on the ngrok server side and then not being able to properly remove them once the CloudEndpoint resource is deleted.

Instead of doing that, this makes the controller keep an in-memory map of the known CloudEndpoint resources so that we can simply check the in-memory map to see if one of them has been created and assigned an ID or not, rather than waiting for the status to be updated and the resource to be re-reconciled again after that.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 49 lines in your changes missing coverage. Please review.

Project coverage is 23.57%. Comparing base (0fac123) to head (ec36c80).

Files with missing lines	Patch %	Lines
...ernal/controller/ngrok/cloudendpoint_controller.go	0.00%	49 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #575      +/-   ##
==========================================
- Coverage   23.66%   23.57%   -0.09%     
==========================================
  Files          88       88              
  Lines       12446    12491      +45     
==========================================
  Hits         2945     2945              
- Misses       9314     9359      +45     
  Partials      187      187              

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