Integrate person information from tab repo

There is additional information in the [gov.yaml](https://github.com/cncf/tab/blob/main/gov.yaml) file within the tab repo that should be integrated with the TAB information stored in [community-roster.json](https://github.com/cncf/endusers/blob/main/data/community-roster.json) and [community-people.json](https://github.com/cncf/endusers/blob/main/data/community-people.json).

groups such as the tab and any user groups should have their name and github handle sycned as well as the items below:
- role
- seat
- term
- start
- end

The profile information gathered from querying github should only be used for filling missing data not provided by the information in community-roster.json

Start by comparing gov.yaml in the tab repository with data/community-roster.json and data/community-people.json. Trace how the repository currently gathers GitHub profile information, then define completion as syncing group and user-group names, handles, roles, seats, and term dates while preserving values already provided in the community JSON files.

Written by the indexing model from the issue text.