OSF: Used model.NewPointer everywhere (#27838)

```release-note
NONE
```

server/channels/app/plugin_api_tests/test_db_driver/main.go

@@ -32,7 +32,7 @@ func (p *MyPlugin) OnConfigurationChange() error {
 func (p *MyPlugin) MessageWillBePosted(_ *plugin.Context, _ *model.Post) (*model.Post, string) {
 	rctx := request.TestContext(p.t)
 	settings := p.API.GetUnsanitizedConfig().SqlSettings
-	settings.Trace = model.NewBool(false)
+	settings.Trace = model.NewPointer(false)
 	store, err := sqlstore.New(settings, rctx.Logger(), nil)
 	if err != nil {
 		panic(err)

server/channels/app/plugin_api_tests/test_update_user_auth_plugin/main.go

@@ -56,7 +56,7 @@ func (p *MyPlugin) MessageWillBePosted(_ *plugin.Context, _ *model.Post) (*model
 	// Update BasicUser to SAML
 	expectedUserAuth := &model.UserAuth{
 		AuthService: model.UserAuthServiceSaml,
-		AuthData:    model.NewString("saml_auth_data"),
+		AuthData:    model.NewPointer("saml_auth_data"),
 	}
 	_, appErr = p.API.UpdateUserAuth(p.configuration.BasicUserID, expectedUserAuth)
 	if appErr != nil {
@@ -69,7 +69,7 @@ func (p *MyPlugin) MessageWillBePosted(_ *plugin.Context, _ *model.Post) (*model
 	// Update BasicUser to LDAP
 	expectedUserAuth = &model.UserAuth{
 		AuthService: model.UserAuthServiceLdap,
-		AuthData:    model.NewString("ldap_auth_data"),
+		AuthData:    model.NewPointer("ldap_auth_data"),
 	}
 	_, err := p.API.UpdateUserAuth(p.configuration.BasicUserID, expectedUserAuth)
 	if err != nil {