Remove deprecated libfuzzer_coverage task (#2021)

- Remove the ability to create or execute a `libfuzzer_coverage` task
- Preserve the enum variant in `onefuzztypes` to prevent errors when deserializing old data
- Remove doc references to `libfuzzer_coverage`

src/api-service/__app__/onefuzzlib/job_templates/defaults/libfuzzer.py

@@ -78,7 +78,7 @@ libfuzzer_linux = JobTemplate(
             job_id=UUID(int=0),
             prereq_tasks=[UUID(int=0)],
             task=TaskDetails(
-                type=TaskType.libfuzzer_coverage,
+                type=TaskType.coverage,
                 duration=1,
                 target_exe="fuzz.exe",
                 target_env={},

src/api-service/__app__/onefuzzlib/tasks/defs.py

@@ -179,40 +179,6 @@ TASK_DEFINITIONS = {
         ],
         monitor_queue=ContainerType.crashes,
     ),
-    TaskType.libfuzzer_coverage: TaskDefinition(
-        features=[
-            TaskFeature.target_exe,
-            TaskFeature.target_env,
-            TaskFeature.target_options,
-            TaskFeature.check_fuzzer_help,
-        ],
-        vm=VmDefinition(compare=Compare.Equal, value=1),
-        containers=[
-            ContainerDefinition(
-                type=ContainerType.setup,
-                compare=Compare.Equal,
-                value=1,
-                permissions=[ContainerPermission.Read, ContainerPermission.List],
-            ),
-            ContainerDefinition(
-                type=ContainerType.readonly_inputs,
-                compare=Compare.AtLeast,
-                value=1,
-                permissions=[ContainerPermission.Read, ContainerPermission.List],
-            ),
-            ContainerDefinition(
-                type=ContainerType.coverage,
-                compare=Compare.Equal,
-                value=1,
-                permissions=[
-                    ContainerPermission.List,
-                    ContainerPermission.Read,
-                    ContainerPermission.Write,
-                ],
-            ),
-        ],
-        monitor_queue=ContainerType.readonly_inputs,
-    ),
     TaskType.libfuzzer_merge: TaskDefinition(
         features=[
             TaskFeature.target_exe,

src/api-service/__app__/onefuzzlib/tasks/main.py

@@ -106,7 +106,7 @@ class Task(BASE_TASK, ORMMixin):
     #     'task_id': '835f7b3f-43ad-4718-b7e4-d506d9667b09',
     #     'state': 'stopped',
     #     'config': {
-    #         'task': {'type': 'libfuzzer_coverage'},
+    #         'task': {'type': 'coverage'},
     #         'vm': {'count': 1}
     #     }
     # }

src/api-service/tests/test_taskdef.py

@@ -25,6 +25,10 @@ class TestTaskDefinition(unittest.TestCase):
 
     def test_all_defined(self) -> None:
         for entry in [TaskType[x] for x in TaskType.__members__]:
+            if entry == TaskType.libfuzzer_coverage:
+                # Deprecated, kept in enum for deserialization back-compat.
+                continue
+
             self.assertIn(entry, TASK_DEFINITIONS)
 
     def test_basic(self) -> None: