ExportAll action doesn’t use LoadDelegate

[KremnevDmitry]

Environment

Jmix version: 2.3.999-SNAPSHOT

Bug Description

If you click the option to ExportAll in the Excel or JSON export action using DTO entity, an empty list will be exported.

The presence of a load delegate for the collection loader is ignored here:

jmix/jmix-gridexport/gridexport-flowui/src/main/java/io/jmix/gridexportflowui/exporter/entitiesloader/KeysetAllEntitiesLoader.java

Lines 122 to 129 in 3894970

	List<?> entities = dataManager.loadList(loadContext);
	for (Object entity : entities) {
	EntityExportContext entityExportContext = new EntityExportContext(entity, ++rowNumber);
	proceedToExport = exportedEntityVisitor.visitEntity(entityExportContext);
	if (!proceedToExport) {
	break;
	}
	}

We should use the same approach as in the collection loader:

jmix/jmix-flowui/flowui/src/main/java/io/jmix/flowui/model/impl/CollectionLoaderImpl.java

Lines 119 to 127 in 3894970

	if (delegate == null) {
	list = dataManager.loadList(loadContext);
	} else {
	list = delegate.apply(loadContext);
	if (list == null) {
	return false;
	}
	}

Steps To Reproduce

1. Define load delegate for the CollectionLoader
2. Try to export data using Grid Export Actions add-on

Current Behavior

An empty list will be exported.

Expected Behavior

All data will be exported.

[SergeiAksenov2]

Tested on:

1. Jmix version: 2.3.999-SNAPSHOT
   Jmix Studio plugin version: 2.3.SNAPSHOT6490-233
   IntelliJ version: IntelliJ IDEA 2023.3.7 (Community Edition)
2. Jmix version: 2.3.999-SNAPSHOT
   Jmix Studio plugin version: 2.3.SNAPSHOT6489-241
   IntelliJ version: IntelliJ IDEA 2024.1.3 (Community Edition)

Added load delegate with condition by entity nameю And this result collection entered to the excel export. Ok.