Fix: Added TLS configuration to bypass certificate verification in testenv

[outscale-hmi]

For test Env:
We are using envtest (from controller-runtime) to start a Kubernetes test environment, which provides a fake Kubernetes API server for local testing. the call testEnv.Start() is to start this environment and obtain a cfg (Kubernetes config).

This PR include the:

• Set InsecureSkipVerify to true in the TLS configuration to allow the use of self-signed certificates during testing.
• Update the minimum TLS version to tls.VersionTLS12 to ensure secure communication while bypassing certificate verification.

=>This change enables the test environment to work with self-signed certificates without triggering certificate validation errors, ensuring smooth execution in environments with non-CA-signed certificates.