Make GIN tests using injection points concurrent-safe

f587338dec87 has introduced in the test module injection_points a SQL
function called injection_points_set_local(), that can be used to make
all the injection points linked to the process where they are attached,
discarded automatically if any remain once the process exits.

e2e3b8ae9ed7 has added a NO_INSTALLCHECK to the test module to prevent
the use of installcheck.  Now that there is a way to make the test
concurrent-safe, let's use it and remove the installcheck restriction.

Concurrency issues could be easily reproduced by running in a tight
loop a command like this one, in src/test/modules/gin/ (hardcoding
pg_sleep() after attaching injection points enlarges the race window)
and a second test suite like contrib/btree_gin/:

  make installcheck USE_MODULE_DB=1

Reviewed-by: Andrey Borodin
Discussion: https://postgr.es/m/ZhNG4Io9uYOgwv3F@paquier.xyz

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