Revert "Temporarily disable all tests that call generate_latest"

This reverts commit d8ab5434d5.

tests/metrics/test_metrics.py

@@ -137,10 +137,8 @@ class TestMauLimit(unittest.TestCase):
 
         return results
 
-RUN_TEST = False
 
 class BuildInfoTests(unittest.TestCase):
-    @unittest.skip_unless(RUN_TEST, "must be enabled")
     def test_get_build(self) -> None:
         """
         The synapse_build_info metric reports the OS version, Python version,
@@ -159,7 +157,6 @@ class BuildInfoTests(unittest.TestCase):
 
 
 class CacheMetricsTests(unittest.HomeserverTestCase):
-    @unittest.skip_unless(RUN_TEST, "must be enabled")
     def test_cache_metric(self) -> None:
         """
         Caches produce metrics reflecting their state when scraped.