fix(ci): resolve two post-rebase test failures

- retry_test.go: replace ptr.Ptr() with local utcPtr() helper since
  internal/pkg/service/common/ptr was deleted on main (replaced by new()
  inline). Add file-local generic helper to avoid re-introducing the
  deleted package.

- operator_test.go: add ts.logger.Truncate() at end of prepareFixtures
  so that subsequent waitForFilesSync calls inside triggerCheck wait for
  a genuine new sync event after rotation, not a stale message left in
  the log buffer from fixture setup.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: Matovidlo

internal/pkg/service/stream/storage/node/coordinator/filerotation/operator_test.go

@@ -364,4 +364,5 @@ func (ts *testState) prepareFixtures(t *testing.T, ctx context.Context) {
 	require.NoError(t, ts.dependencies.DefinitionRepository().Source().Create(&source, ts.clk.Now(), test.ByUser(), "create").Do(ctx).Err())
 	require.NoError(t, ts.dependencies.DefinitionRepository().Sink().Create(&ts.sink, ts.clk.Now(), test.ByUser(), "create").Do(ctx).Err())
 	ts.waitForFilesSync(t)
+	ts.logger.Truncate()
 }