Fix test_set POST api
Fix test_set POST api

Fix _check_and_get_test_suite to return the suite_name as expected

Fixes: f3742b347911 Add function to import a test case.
Signed-off-by: Loys Ollivier <cf753bdad1a7a04cbd646be8ae1090a890fabf47@baylibre.com>
kernelci/kernelci-backend,kernelci/kernelci-backend