chromite: Split long strings on lines > 80 chars.

Black will only split strings at spaces.

We can tweak its `SPLIT_SAFE_CHARS` to split elsewhere -
https://github.com/psf/black/blob/main/src/black/trans.py#L76

Allowing splits at "-","/", and "." lets it deal with a few more
long strings in chromite automatically, so there will be fewer
suppressions when the line-too-long lint is introduced.

BUG=b:233893248
TEST=cros lint + CQ

Change-Id: Ic092be1d0a80a4c13fac30d19756db715b42b8dd
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/4535497
Commit-Queue: Trent Apted <tapted@chromium.org>
Reviewed-by: Jack Rosenthal <jrosenth@chromium.org>
Tested-by: Trent Apted <tapted@chromium.org>
diff --git a/scripts/sysmon/git_metrics_unittest.py b/scripts/sysmon/git_metrics_unittest.py
index bff7789..67be8a6 100644
--- a/scripts/sysmon/git_metrics_unittest.py
+++ b/scripts/sysmon/git_metrics_unittest.py
@@ -22,7 +22,8 @@
 
     def setUp(self):
         patcher = mock.patch(
-            "chromite.third_party.infra_libs.ts_mon.common.interface.state.store",
+            "chromite.third_party.infra_libs.ts_mon.common.interface.state."
+            "store",
             autospec=True,
         )
         self.store = patcher.start()