[Tizen] Update coverage auto measurement script

[Tizen] Update coverage auto measurement script

 - Exclude 'ml-api-common-tizen-feature-check.c' and
'ml-api-inference-tizen-privilege-check.c' from the coverage report.
 - Change test directory before running the tests.

Error:
[DEBUG]:[ RUN      ] [mMLAgentTest.call_method
Error : GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.tizen.machinelearning.service was not provided by any .service files
[DEBUG]:../tests/daemon/unittest_ml_agent.cc:87: Failure

Signed-off-by: gichan2-jang <gichan2.jang@samsung.com>