montior: remove "unit" from Progress (YAGNI)

Removing "unit" from progress as it is currently unused and we
can always add it back when we have a real use-case.

osbuild/monitor.py

@@ -113,10 +113,9 @@ class Context:
 
 
 class Progress:
-    def __init__(self, name: str, total: int, unit: Optional[str] = None):
+    def __init__(self, name: str, total: int):
         self.name = name
         self.total = total
-        self.unit = unit
         self.done = None
         self._sub_progress: Optional[Progress] = None
 
@@ -144,7 +143,6 @@ class Progress:
             "name": self.name,
             "total": self.total,
             "done": self.done,
-            "unit": self.unit,
         }
         if self._sub_progress:
             d["progress"] = self._sub_progress.as_dict()

test/mod/test_monitor.py

@@ -159,7 +159,7 @@ def test_context():
 
 
 def test_progress():
-    prog = Progress("test", total=12, unit="tests")
+    prog = Progress("test", total=12)
     subprog = Progress("test-sub1", total=3)
     prog.sub_progress(subprog)
     assert prog.done is None  # starts with None until the first incr()