Move prepare_controllers alongside Concierge server code

internal/concierge/server/prepare_controllers.go

@@ -1,9 +1,7 @@
 // Copyright 2020-2024 the Pinniped contributors. All Rights Reserved.
 // SPDX-License-Identifier: Apache-2.0
 
-// Package controllermanager provides an entrypoint into running all of the controllers that run as
-// a part of Pinniped.
-package controllermanager
+package server
 
 import (
 	"fmt"

internal/concierge/server/server.go

@@ -32,7 +32,6 @@ import (
 	"go.pinniped.dev/internal/config/featuregates"
 	"go.pinniped.dev/internal/controller/authenticator/authncache"
 	"go.pinniped.dev/internal/controllerinit"
-	"go.pinniped.dev/internal/controllermanager"
 	"go.pinniped.dev/internal/crypto/ptls"
 	"go.pinniped.dev/internal/downward"
 	"go.pinniped.dev/internal/dynamiccert"
@@ -152,8 +151,8 @@ func (a *App) runServer(ctx context.Context) error {
 
 	// Prepare to start the controllers, but defer actually starting them until the
 	// post start hook of the aggregated API server.
-	buildControllers, err := controllermanager.PrepareControllers(
-		&controllermanager.Config{
+	buildControllers, err := PrepareControllers(
+		&Config{
 			ServerInstallationInfo:           podInfo,
 			APIGroupSuffix:                   *cfg.APIGroupSuffix,
 			NamesConfig:                      &cfg.NamesConfig,