Fix grid caching data issue

[dragulceo]

Fixes #223

The only question I had (which was also the reason I did not make this pull request before) was the reasoning behind the datagrid caching. The reasoning is unknown to me but thinking out loud right now I realize that this caching is useful only when you rerender the grid and the data (the collection) is fetched already. So it is safe to use the gridId instead of the gridName (which conflicts with other grids with the same name).

Thank you.

[alex-kuzmenko]

To have more control over grid name, you can use oro_datagrid_build_fullname twig function. For example:

{% set gridName = oro_datagrid_build_fullname('entity-relation-grid', entity_name ~ '-' ~  field_name) %}

[Grygir]

This solution breaks grid cache functionality. gridId is generated each time with unique suffix (e.g. 'grid-accounts-grid-1727381985', then 'grid-accounts-grid-464493576'), so we can not read from the cache by this key.

Regarding your issue #223, see how grid name is built:

    gridName: oro_datagrid_build_fullname(datagrid.name, datagrid.scope),

changing datagrid scope you can create similar grids for different entities.

For more details see DataGrid Scope documentation.