Enable Otterdog for eclipse-modeling

[heurtematte]

Ticket to keep track of the necessary steps to enable otterdog for the eclipse-modeling project.

• [ ] Contacted project via https://gitlab.eclipse.org/eclipsefdn/helpdesk/-/issues/
• [x] Created bot user and added credentials to pass cbi repo
• [x] Enable 2FA for bot user and add to pass
• [x] Push credential to pass
• [x] Configured bot user for the org to be the owner
• [x] Created .eclipsefdn repo
• [x] Added configuration for eclipse-modeling to https://github.com/EclipseFdn/otterdog-configs/
• [x] Added GitHub organization to PMI
• [x] Invited GitHub organization to Eclipse Foundation Enterprise
• [x] Installed Otterdog GitHub App
• [x] Pushed config to .eclipsefdn repo