Disable tests using injection points in installcheck

The 'gin' test injections faults to GIN index build. If another test
running concurrently in the same cluster also tries to create a GIN
index, it will hit the fault, too.

To fix, disable tests using injection points when running against an
existing cluster. A better long-term solution would be to make the
injection points scoped to the database or process, but this will do
for now.

Discussion: https://www.postgresql.org/message-id/CA%2BhUKGJYhcG_o2nwSK6r01eOZJwNWUJUbX%3D%3DAVnW84f-%2B8yamQ@mail.gmail.com
Discussion: https://www.postgresql.org/message-id/10fd6cdd-c5d9-46fe-9fa1-7e661191309e@iki.fi

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