Add $args['hook_extra'] to upgrader_source_selection filter

[afragen]

After much discussion with @dd32, regarding the upgrader_source_selection filter it was determined that adding an additional parameter, $args['hook_extra'], would make the filter more useful and result in less overhead than other possible solutions, see #34617 and #34661.

Adding this parameter allows the developer to avoid the use of globals, particularly $plugins or $themes, when trying to determine what is being updated.

As an extra parameter, this should result in no breakage as the additional parameter would be ignored under current use conditions.

[dd32]

In 35642:

Upgrader: Pass the $args['hook_extra'] context to the upgrader_source_selection filter.
Props afragen
Fixes #34696