Don't do unnecessary queries when listing subprojects #6869
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This together with:
reduces a lot of queries and without changing the current UI.
This is a benchmark using the django debug toolbar:
Before: 138 queries with 7 subprojects, 17 queries per each additional subproject
With all the changes: 28 queries with 7 subprojects, 1 query per each additional subproject
Fixes #6455