Propagate result phase into report plugins

tmt/result.py

@@ -125,6 +125,11 @@ def show(self) -> str:
         return ' '.join(components)
 
 
+@dataclasses.dataclass
+class PhaseResult(BaseResult):
+    """ Describes what tmt knows about a single test phase result (sub-result) """
+
+
 @dataclasses.dataclass
 class CheckResult(BaseResult):
     """ Describes what tmt knows about a single test check result """
@@ -159,6 +164,13 @@ class Result(BaseResult):
         unserialize=lambda serialized: ResultGuestData.from_serialized(serialized)
         )
 
+    phase: list[PhaseResult] = field(
+        default_factory=cast(Callable[[], list[PhaseResult]], list),
+        serialize=lambda results: [result.to_serialized() for result in results],
+        unserialize=lambda serialized: [
+            PhaseResult.from_serialized(phase) for phase in serialized]
+        )
+
     check: list[CheckResult] = field(
         default_factory=cast(Callable[[], list[CheckResult]], list),
         serialize=lambda results: [result.to_serialized() for result in results],