Revert "Mm 30807 granular data retention scaffold (#16891)" (#17437)

This reverts commit 3ea75332e7.

einterfaces/data_retention.go

@@ -8,19 +8,5 @@ import (
 )
 
 type DataRetentionInterface interface {
-	GetGlobalPolicy() (*model.GlobalRetentionPolicy, *model.AppError)
-	GetPolicies(offset, limit int) (*model.RetentionPolicyWithTeamAndChannelCountsList, *model.AppError)
-	GetPoliciesCount() (int64, *model.AppError)
-	GetPolicy(policyID string) (*model.RetentionPolicyWithTeamAndChannelCounts, *model.AppError)
-	CreatePolicy(policy *model.RetentionPolicyWithTeamAndChannelIDs) (*model.RetentionPolicyWithTeamAndChannelCounts, *model.AppError)
-	PatchPolicy(patch *model.RetentionPolicyWithTeamAndChannelIDs) (*model.RetentionPolicyWithTeamAndChannelCounts, *model.AppError)
-	DeletePolicy(policyID string) *model.AppError
-	GetTeamsForPolicy(policyID string, offset, limit int) (*model.TeamsWithCount, *model.AppError)
-	AddTeamsToPolicy(policyID string, teamIDs []string) *model.AppError
-	RemoveTeamsFromPolicy(policyID string, teamIDs []string) *model.AppError
-	GetChannelsForPolicy(policyID string, offset, limit int) (*model.ChannelsWithCount, *model.AppError)
-	AddChannelsToPolicy(policyID string, channelIDs []string) *model.AppError
-	RemoveChannelsFromPolicy(policyID string, channelIDs []string) *model.AppError
-	GetTeamPoliciesForUser(userID string, offset, limit int) (*model.RetentionPolicyForTeamList, *model.AppError)
-	GetChannelPoliciesForUser(userID string, offset, limit int) (*model.RetentionPolicyForChannelList, *model.AppError)
+	GetPolicy() (*model.DataRetentionPolicy, *model.AppError)
 }