Add WCI worker deployment routing and manager integration tests

Cover SetWorkerDeploymentCurrentVersion, SetWorkerDeploymentRampingVersion,
and SetWorkerDeploymentManager against the in-process WCI test environment:

- SetCurrentVersion: happy path, set-to-unversioned (with drainage to
  DRAINED), the missing-task-queue guardrail plus its
  ignore_missing_task_queues override exercised on a single backlogged
  state, and stale-conflict-token rejection.
- SetRampingVersion: happy path, clear ramp (DRAINING -> DRAINED),
  ramping-equals-current rejection, and invalid-percentage rejection.
- SetManager: set and override the manager identity, stale-conflict-token
  rejection, and enforcement that a routing mutation from a non-manager
  identity is rejected.

Add setup helpers (setupPolledVersion, createUnpolledVersion,
setupCurrentPlusSecondVersion) and configure fast version drainage in the
test env so DRAINING -> DRAINED transitions are observable within the test
window.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: 2 people

tests/integration/env.go

@@ -3,11 +3,21 @@ package integration
 
 import (
 	"testing"
+	"time"
 
 	"go.temporal.io/auto-scaled-workers/wci/client"
+	"go.temporal.io/server/common/dynamicconfig"
 	"go.temporal.io/server/tests/testcore"
 )
 
+// Drain worker deployment versions quickly so tests that clear a current/ramping
+// version can observe the DRAINING -> DRAINED transition without waiting on the
+// multi-minute production defaults.
+const (
+	testVersionDrainageRefreshInterval       = 3 * time.Second
+	testVersionDrainageVisibilityGracePeriod = 3 * time.Second
+)
+
 // createWCITestEnv starts an in-process Temporal server with the WCI worker component registered
 // and returns a TestEnv ready for use. Cleanup is registered via t.Cleanup.
 func createWCITestEnv(t *testing.T) *testcore.TestEnv {
@@ -17,5 +27,7 @@ func createWCITestEnv(t *testing.T) *testcore.TestEnv {
 		testcore.WithDedicatedCluster(),
 		testcore.WithWorkerService("WCI"),
 		testcore.WithDynamicConfig(client.WorkerControllerEnabled, true),
+		testcore.WithDynamicConfig(dynamicconfig.VersionDrainageStatusRefreshInterval, testVersionDrainageRefreshInterval),
+		testcore.WithDynamicConfig(dynamicconfig.VersionDrainageStatusVisibilityGracePeriod, testVersionDrainageVisibilityGracePeriod),
 	)
 }