Add support for cmocka assert testing by overriding REQUIRE/INSIST/... macros...

Add support for cmocka assert testing by overriding REQUIRE/INSIST/... macros when UNIT_TESTING is defined

(cherry picked from commit 52731c00)
18 jobs for 250-integrate-cmocka-into-our-build-scripts-v9_12 in 8 minutes and 13 seconds (queued for 4 seconds)