Make Grafana integration configurable at Organisation level

[khvn26]

Is your feature request related to a problem? Please describe.

Currently, if a user means to enable the Grafana integration org-wide, they have to set it up for every project.

Describe the solution you'd like.

Allow to set up the Grafana integration at organisation level, and/or instance-wide.

Describe alternatives you've considered

N/A

Additional context

The task will include implementing an organisation integration flow in addition to project and environment ones.