Improve Go client testing

[w1am]

Changed: I've refactored parts of the code to allow tests to run without dependencies on functions that create the DB client.

• Added a Makefile to execute SingleNode, SecureNode, and ClusterNode tests.
• Toggle between secure and insecure modes by passing an environment variable.

Todo

• Must change git branch rules status checks

[linear[bot]]

DEV-140 Improve Golang client testing