Add matrix for pull request and fix provision playbook reference in test workflows

[Enaraque]

Description

The purpose of this PR is to fix various bugs found in the installation assistant's test workflows.

Firstly, Ubuntu 22 has been added to the Test_installation_assistant matrix as a system, ensuring it functions correctly on pull requests, and the condition in the Test_installation_assistant_distributed matrix has also been fixed.

Additionally, the environment variable WAZUH_INSTALLATION_ASSISTANT_REFERENCE has been added so that if a pull request triggers the workflow, it uses the branch that activated it (github.head_ref) as a reference. If triggered manually, it will use the corresponding input (WAZUH_INSTALLATION_ASSISTANT_REFERENCE).

Lastly, some of the variables used in the workflow, like VERBOSITY and AUTOMATION_REFERENCE, were only set when the workflow was triggered manually. This caused the steps that required these variables to fail when the workflow was run via a pull request. This has been resolved by adding environment variables with the same names and setting the correct values based on how the workflow was triggered.

Testing

Manually executed workflows

• Test_installation_assistant: https://github.com/wazuh/wazuh-installation-assistant/actions/runs/11707841156/job/32608150945
• Test_installation_assistant_distributed: https://github.com/wazuh/wazuh-installation-assistant/actions/runs/11707851982/job/32608191310

Pull Request executed workflows

• Test_installation_assistant: https://github.com/wazuh/wazuh-installation-assistant/actions/runs/11704427875/job/32596856921
• Test_installation_assistant_distributed: https://github.com/wazuh/wazuh-installation-assistant/actions/runs/11704427873/job/32596856896

Related issue

• Test workflows do not perform as expected #135