LPS-35376 PORTLET_METADATA_ALL parameter is not namespaced.

The PORTLET_METADATA_ALL is a general parameter and it's not namespaced to an application.
LPS-35376 Use PORTLET_DATA_ALL instead of PORTLET_METADATA_ALL.

In the new export/import/staging dialogs the portlet data and metadata are configured together. This means that if PORTLET_DATA_ALL is true, all the portlet data and metadata will be considered. Thus, the PORTLET_METADATA_ALL param is no longer necessary.