Remove old permission columns from project table

[dancoates]

After the last permissions update, we no longer need the group ids and names in the project table. All permissions are managed by the project members table now.

Note: we'd not normally want to remove columns as it affects the ability to query the system versioned tables for history of those columns. In this case it is ok as we have permission changes recorded in cpg-infra, and we're not actively using the permission history anywhere.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.75%. Comparing base (9b7f2de) to head (42d0b69).
Report is 1 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #997   +/-   ##
=======================================
  Coverage   81.75%   81.75%           
=======================================
  Files         184      184           
  Lines       15969    15969           
=======================================
  Hits        13056    13056           
  Misses       2913     2913           

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