Fix the handling with testing farm results
When we get the results from testing farm, we do not process them correctly:
`[2020-03-17 16:08:07,532: WARNING/ForkPoolWorker-1] There is no handler for testing_farm_results event.`
`16:08:07.533 jobs.py           DEBUG  All jobs finished!`

Therefore the PR statuses are not updated.
diff --git a/packit_service/trigger_mapping.py b/packit_service/trigger_mapping.py
index 9d622339..49bfb622 100644
--- a/packit_service/trigger_mapping.py
+++ b/packit_service/trigger_mapping.py
@@ -36,6 +36,7 @@ MAP_JOB_TRIGGER_TO_JOB_CONFIG_TRIGGER_TYPE: Dict[
     TheJobTriggerType.pr_comment: JobConfigTriggerType.pull_request,
     TheJobTriggerType.copr_start: JobConfigTriggerType.pull_request,
     TheJobTriggerType.copr_end: JobConfigTriggerType.pull_request,
+    TheJobTriggerType.testing_farm_results: JobConfigTriggerType.pull_request,
 }
 
 
diff --git a/tests/unit/test_jobs.py b/tests/unit/test_jobs.py
index 443e7bcb..d67c0bea 100644
--- a/tests/unit/test_jobs.py
+++ b/tests/unit/test_jobs.py
@@ -29,6 +29,7 @@ from packit_service.worker.handlers import (
     ProposeDownstreamHandler,
     CoprBuildStartHandler,
     CoprBuildEndHandler,
+    TestingFarmResultsHandler,
 )
 from packit_service.worker.handlers.github_handlers import (
     PullRequestGithubKojiBuildHandler,
@@ -199,6 +200,35 @@ from packit_service.worker.jobs import get_handlers_for_event
             {CoprBuildEndHandler},
             id="config=tests@trigger=copr_end",
         ),
+        pytest.param(
+            TheJobTriggerType.testing_farm_results,
+            [
+                JobConfig(
+                    type=JobType.tests,
+                    trigger=JobConfigTriggerType.pull_request,
+                    metadata={},
+                )
+            ],
+            {TestingFarmResultsHandler},
+            id="config=tests@trigger=testing_farm_results",
+        ),
+        pytest.param(
+            TheJobTriggerType.testing_farm_results,
+            [
+                JobConfig(
+                    type=JobType.tests,
+                    trigger=JobConfigTriggerType.pull_request,
+                    metadata={},
+                ),
+                JobConfig(
+                    type=JobType.copr_build,
+                    trigger=JobConfigTriggerType.pull_request,
+                    metadata={},
+                ),
+            ],
+            {TestingFarmResultsHandler},
+            id="config=tests_and_copr_build@trigger=testing_farm_results",
+        ),
         pytest.param(
             TheJobTriggerType.pull_request,
             [
['packit_service/trigger_mapping.py', 'tests/unit/test_jobs.py']