feat: Add option to disable validate_certs

[KB-perByte]

Summary

Adds an optional validate_certs field on each galaxy_servers entry in EE configuration (--ee-config / --ee-config-file). When set to false, the generated ansible.cfg includes validate_certs = false for that [galaxy_server.] section so ansible-galaxy can talk to hubs that use certificates the EE image does not trust (for example, internal Automation Hub with a private CA).

Example

{
  "galaxy_servers": [
    {
      "id": "private_hub",
      "url": "https://pah.example.com/api/galaxy/content/published/",
      "token_required": true,
      "validate_certs": false
    }
  ]
}

Steps to check

rm -rf /tmp/ee-validate-certs-test
uv run ansible-creator init execution_env /tmp/ee-validate-certs-test \
  --ee-config '{
    "base_image": "registry.redhat.io/ansible-automation-platform-25/ee-minimal-rhel8:latest",
    "galaxy_servers": [
      {
        "id": "private_hub",
        "url": "https://pah.example.com/api/galaxy/content/published/",
        "token_required": true,
        "validate_certs": false
      },
      {
        "id": "galaxy",
        "url": "https://galaxy.ansible.com/"
      }
    ],
    "collections": [{"name": "ansible.posix"}]
  }'

Tests

 uv run pytest tests/units/test_init_ee.py::test_ee_project_with_galaxy_servers \
  tests/units/test_init_ee.py::test_galaxy_server_from_dict_validate_certs_false -q
======================================================== test session starts =========================================================
platform linux -- Python 3.13.12, pytest-9.0.2, pluggy-1.6.0
cachedir: .cache/.pytest
rootdir: /home/kbperbyte/Work/contributions/ansible-creator
configfile: pyproject.toml
plugins: instafail-0.5.0, xdist-3.8.0, plus-0.8.1
collected 2 items                                                                                                                    

tests/units/test_init_ee.py ..                                                                                                 [100%]

======================================================== slowest 10 durations ========================================================
0.01s call     tests/units/test_init_ee.py::test_ee_project_with_galaxy_servers

(5 durations < 0.005s hidden.  Use -vv to show these durations.)