Remove MatchingLoadUserData config (#7148)

## What changed?
Remove this obsolete config.

## Why?
It's not used anymore.

common/dynamicconfig/constants.go

@@ -1080,14 +1080,6 @@ See DynamicRateLimitingParams comments for more details.`,
 		primitives.GetHistoryMaxPageSize,
 		`MatchingHistoryMaxPageSize is the maximum page size of history events returned on PollWorkflowTaskQueue requests`,
 	)
-	MatchingLoadUserData = NewTaskQueueBoolSetting(
-		"matching.loadUserData",
-		true,
-		`MatchingLoadUserData can be used to entirely disable loading user data from persistence (and the inter node RPCs
-that propoagate it). When turned off, features that rely on user data (e.g. worker versioning) will essentially
-be disabled. When disabled, matching will drop tasks for versioned workflows and activities to avoid breaking
-versioning semantics. Operator intervention will be required to reschedule the dropped tasks.`,
-	)
 	MatchingUpdateAckInterval = NewTaskQueueDurationSettingWithConstrainedDefault(
 		"matching.updateAckInterval",
 		[]TypedConstrainedValue[time.Duration]{

service/matching/config.go

@@ -113,8 +113,6 @@ type (
 		VisibilityDisableOrderByClause          dynamicconfig.BoolPropertyFnWithNamespaceFilter
 		VisibilityEnableManualPagination        dynamicconfig.BoolPropertyFnWithNamespaceFilter
 
-		LoadUserData dynamicconfig.BoolPropertyFnWithTaskQueueFilter
-
 		ListNexusEndpointsLongPollTimeout dynamicconfig.DurationPropertyFn
 		NexusEndpointsRefreshInterval     dynamicconfig.DurationPropertyFn
 
@@ -214,7 +212,6 @@ func NewConfig(
 		PersistenceDynamicRateLimitingParams:     dynamicconfig.MatchingPersistenceDynamicRateLimitingParams.Get(dc),
 		PersistenceQPSBurstRatio:                 dynamicconfig.PersistenceQPSBurstRatio.Get(dc),
 		SyncMatchWaitDuration:                    dynamicconfig.MatchingSyncMatchWaitDuration.Get(dc),
-		LoadUserData:                             dynamicconfig.MatchingLoadUserData.Get(dc),
 		HistoryMaxPageSize:                       dynamicconfig.MatchingHistoryMaxPageSize.Get(dc),
 		EnableDeployments:                        dynamicconfig.EnableDeployments.Get(dc),
 		MaxTaskQueuesInDeployment:                dynamicconfig.MatchingMaxTaskQueuesInDeployment.Get(dc),