Definitions of jobs running unit tests under TSAN contain an
"after_script" YAML key.  Since the "unit_test_job" anchor is included
in those job definitions before "after_script" is defined, the
job-specific value of that key overrides the one defined in the included
anchor.  This prevents "kyua report-html" from being run for TSAN unit
test jobs.  Moving the invocation of "kyua report-html" to the "script"
key in the "unit_test_job" anchor is not acceptable as it would cause
the exit code of that command to determine the result of all unit test
jobs and we need that to be the exit code of "make unit".  Instead, add
"kyua report-html" invocations to the "after_script" key of TSAN unit
test job definitions to address the problem without affecting other job
definitions.