Rename open_GCP_extramural.md to open_project_extramural.md

[zbyosufzai]

Pull Request Template

Description

changed link name to match emails and tested and updated genai tutorials

Assignee

Assignees: @kyleoconnell-NIH

PR checklist

Please ensure the following:

• [ ] This comment contains a description of changes (with reason).
• [ ] All changes were tested.
• [ ] If you've fixed a bug mention the issue number/name.
• [ ] Apply approriate tags (e.g. documentation, bug)