Extract protoutils package (temporalio#5422)

## What changed?
<!-- Describe what has changed in this PR -->
Extract `common/testing/protoutils` package.

## Why?
<!-- Tell your future self why have you made these changes -->
I plan to use this package outside of functional tests.

## How did you test it?
<!-- How have you verified this change? Tested locally? Added a unit
test? Checked in staging env? -->
Run tests.

## Potential risks
<!-- Assuming the worst case, what can be broken when deploying this
change to production? -->
No risks.

## Is hotfix candidate?
<!-- Is this PR a hotfix candidate or does it require a notification to
be sent to the broader community? (Yes/No) -->
No.

common/testing/protoutils/any.go

@@ -0,0 +1,55 @@
+// The MIT License
+//
+// Copyright (c) 2020 Temporal Technologies Inc.  All rights reserved.
+//
+// Copyright (c) 2020 Uber Technologies, Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+package protoutils
+
+import (
+	"reflect"
+
+	"github.com/stretchr/testify/require"
+	"google.golang.org/protobuf/proto"
+	"google.golang.org/protobuf/types/known/anypb"
+)
+
+func UnmarshalAny[T proto.Message](t require.TestingT, a *anypb.Any) T {
+	if th, ok := t.(interface{ Helper() }); ok {
+		th.Helper()
+	}
+	pb := new(T)
+	ppb := reflect.ValueOf(pb).Elem()
+	pbNew := reflect.New(reflect.TypeOf(pb).Elem().Elem())
+	ppb.Set(pbNew)
+
+	require.NoError(t, a.UnmarshalTo(*pb))
+	return *pb
+}
+
+func MarshalAny(t require.TestingT, pb proto.Message) *anypb.Any {
+	if th, ok := t.(interface{ Helper() }); ok {
+		th.Helper()
+	}
+	a, err := anypb.New(pb)
+	require.NoError(t, err)
+	return a
+}

common/testing/runtime/goroutine.go

@@ -38,6 +38,8 @@ import (
 
 // WaitGoRoutineWithFn waits for a go routine with the given function to appear within the duration.
 func WaitGoRoutineWithFn(t testing.TB, fn any, maxDuration time.Duration) {
+	t.Helper()
+
 	targetFnName, ok := functionNameForPC(reflect.ValueOf(fn).Pointer())
 	if !ok {
 		t.Errorf("Invalid function %#v", fn)

tests/functional.go

@@ -25,20 +25,16 @@
 package tests
 
 import (
-	"reflect"
 	"time"
 
 	"github.com/stretchr/testify/require"
 	commonpb "go.temporal.io/api/common/v1"
 	"go.temporal.io/api/workflowservice/v1"
-	"go.temporal.io/server/common/testing/historyrequire"
-	"google.golang.org/protobuf/proto"
-	"google.golang.org/protobuf/types/known/anypb"
-
 	"go.temporal.io/server/api/adminservice/v1"
 	"go.temporal.io/server/common"
 	"go.temporal.io/server/common/dynamicconfig"
 	"go.temporal.io/server/common/payloads"
+	"go.temporal.io/server/common/testing/historyrequire"
 	"go.temporal.io/server/common/testing/protorequire"
 )
 
@@ -99,24 +95,6 @@ func (s *FunctionalSuite) closeShard(wid string) {
 	s.NoError(err)
 }
 
-func unmarshalAny[T proto.Message](s *FunctionalSuite, a *anypb.Any) T {
-	s.T().Helper()
-	pb := new(T)
-	ppb := reflect.ValueOf(pb).Elem()
-	pbNew := reflect.New(reflect.TypeOf(pb).Elem().Elem())
-	ppb.Set(pbNew)
-
-	s.NoError(a.UnmarshalTo(*pb))
-	return *pb
-}
-
-func marshalAny(s *FunctionalSuite, pb proto.Message) *anypb.Any {
-	s.T().Helper()
-	a, err := anypb.New(pb)
-	s.NoError(err)
-	return a
-}
-
 func decodeString(s *FunctionalSuite, pls *commonpb.Payloads) string {
 	s.T().Helper()
 	var str string