Added notebook for org admins to determine workspace owners/creator

[kvo3]

Adds a Jupyter notebook that maps GCP project IDs to Workbench workspaces, showing workspace details and owners. Org admins can paste one or more GCP project IDs and get back who created and owns each workspace.

Context

Org admins with Billing Admin on their pod's GCP billing account can view spend by GCP project ID in the Billing Console, but have no way to join those project IDs to workspace owners/creators.

Output

Two tables:

• Workspace Details — one row per workspace: GCP project ID, workspace ID/UFID, display name, creation date, creator email, state, whether it's a data collection
• Workspace Owners — one row per owner: owner email, grant type (DIRECT or GROUP), and which group granted the role if applicable. Expands group membership so individual members are listed

BENCH-9639

[emmarogge]

LGTM