[MM-25659] ability to permanent delete channel through client (#15202)

Summary

    Ability to permanent delete channel through client

Ticket Link

    https://mattermost.atlassian.net/browse/MM-25659

model/config.go

@@ -329,6 +329,7 @@ type ServiceSettings struct {
 	DEPRECATED_DO_NOT_USE_ImageProxyOptions           *string `json:"ImageProxyOptions" mapstructure:"ImageProxyOptions"` // This field is deprecated and must not be used.
 	EnableAPITeamDeletion                             *bool
 	EnableAPIUserDeletion                             *bool
+	EnableAPIChannelDeletion                          *bool
 	ExperimentalEnableHardenedMode                    *bool
 	DisableLegacyMFA                                  *bool `restricted:"true"`
 	ExperimentalStrictCSRFEnforcement                 *bool `restricted:"true"`
@@ -705,6 +706,10 @@ func (s *ServiceSettings) SetDefaults(isUpdate bool) {
 		s.EnableAPIUserDeletion = NewBool(false)
 	}
 
+	if s.EnableAPIChannelDeletion == nil {
+		s.EnableAPIChannelDeletion = NewBool(false)
+	}
+
 	if s.ExperimentalEnableHardenedMode == nil {
 		s.ExperimentalEnableHardenedMode = NewBool(false)
 	}