feat: add variables to set AppProject, labels and destination cluster

[lentidas]

Description of the changes

This PR:

• Adds the required variables and configuration to allow the module to be deployed on a different cluster than Argo CD.
• Adds the possibility of placing the application inside a specified Argo CD project in order to avoid having a single project for each application throughout multiple clusters.
• Adds labels and a variable to add more labels to the Argo CD application to make it easier to sort applications on the web interface of Argo CD.
• Updates the image of OAuth2-Proxy.

All these changes are made in preparation for having a centralized Argo CD that controls applications throughout multiple clusters.

⚠️ Do a Rebase and merge.

Breaking change

• No

Tests executed on which distribution(s)

• SKS (Exoscale)