[CLI Improvements] Migrate Tests to resource manager architecture - Backend

[danielbdias]

Similar to the previous resources, we need to update the backend to move the test entity logic to be spread out into multiple parts of the code to be centralized and integrated into the resources framework.

In order to have more granular work and visibility of the work that needs to be done, this task is divided into the following:

• [CLI Improvements] Migrate Tests to resource manager architecture - Backend - Test Run Repository #2608
• [CLI Improvements] Migrate Tests to resource manager architecture - Backend - Test Manager #2607
• [CLI Improvements] Migrate Tests to resource manager architecture - GET /tests - Backend #2652
• [CLI Improvements] Migrate Tests to resource manager architecture - Backend - GET /tests/{id} #2656
• [CLI Improvements] Migrate Tests to resource manager architecture - Backend - POST /tests #2653
• [CLI Improvements] Migrate Tests to resource manager architecture - Backend - PUT /tests #2654
• [CLI Improvements] Migrate Tests to resource manager architecture - Backend - DELETE /tests #2655
• [CLI Improvements] Migrate Tests to resource manager architecture - POST /tests/{id}/run - CLI #2609
• [CLI Improvements] Migrate Tests to resource manager architecture - POST /tests/{id}/run - Backend #2610