feat(robot): forward InternalIPs by default on Robot nodes

[lukasmetzner]

Whenever a user configures the --node-ip flag, we forward the configured IPs. We validate if the IP already exists as an ExternalIP and does not collide with the configured address family. This improves the Robot support for HCCM, as users can configure private IPs for Robot nodes.

Forwarding only happens during the initialization phase of HCCM and should therefore not break existing clusters.

This feature can be disabled by setting the environment variable ROBOT_FORWARD_INTERNAL_IPS to false.

Co-authored-by: Alexander Block ablock84@gmail.com

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 13 lines in your changes missing coverage. Please review.

Project coverage is 70.59%. Comparing base (427ea35) to head (81c5c43).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
hcloud/instances.go	81.81%	5 Missing and 3 partials ⚠️
internal/config/config.go	40.00%	2 Missing and 1 partial ⚠️
hcloud/instances_util.go	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #865      +/-   ##
==========================================
- Coverage   70.69%   70.59%   -0.10%     
==========================================
  Files          31       31              
  Lines        3310     3343      +33     
==========================================
+ Hits         2340     2360      +20     
- Misses        795      804       +9     
- Partials      175      179       +4     

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