[task scheduler] Move files from build_scheduler/ to task_scheduler/

task_scheduler/go/db/comments_test.go

 package db
 
 import (
         "fmt"
         "testing"
         "time"
 
         assert "github.com/stretchr/testify/require"
 
         "go.skia.org/infra/go/testutils"
@@ skipping 256 matching lines @@
         assert.Error(t, db.DeleteTaskSpecComment(sc1))
         assert.Error(t, db.DeleteCommitComment(cc1))
 
         // Assert nothing has changed.
         {
                 actual, err := db.GetCommentsForRepos([]string{"r1", "r2"}, now.Add(-10000*time.Hour))
                 assert.NoError(t, err)
                 testutils.AssertDeepEqual(t, expected, actual)
         }
 }