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

task_scheduler/go/scheduling/specs_test.go

-package task_scheduler
+package scheduling
 
 import (
         "encoding/json"
         "path"
         "testing"
         "time"
 
         assert "github.com/stretchr/testify/require"
         "go.skia.org/infra/go/gitinfo"
         "go.skia.org/infra/go/testutils"
@@ skipping 119 matching lines @@
                 "a": []string{},
                 "b": []string{"a"},
                 "c": []string{"a"},
                 "d": []string{"b"},
                 "e": []string{"b"},
                 "f": []string{"c"},
                 "g": []string{"d", "e", "f"},
         }))
         assert.NoError(t, err)
 }