ci: enable various runtime checks on FreeBSD and macOS

ci: enable various runtime checks on FreeBSD and macOS

Increase likelihood of discovering problems during CI rather the buildfarm by
defining -DRELCACHE_FORCE_RELEASE -DCOPY_PARSE_PLAN_TREES
-DWRITE_READ_PARSE_PLAN_TREES -DRAW_EXPRESSION_COVERAGE_TEST on FreeBSD, and
-DRANDOMIZE_ALLOCATED_MEMORY on macOS.

FreeBSD and macoS are currently not CI bottlenecks, so we can afford to
increase their test times a bit.

Author: Justin Pryzby 
Discussion: https://postgr.es/m/20220910200542[email protected]