GUI should use ./releasables and ./deployables API for "Store to Git Repository" operation

Current Situation

• When calling the operation "Store to Git Repository" a modal window opens and shows a tree with objects to select and store. This tree will be filled with objects from a single ./deployables API call.
• All releasable objects are missing and cannot be selected from the tree of the modal window.

Desired Behavior

• When calling the operation "Store to Git Repository" a call to both APIs, ./deployables and ./releasables has to be performed to receive all relevant objects.
• The objects have to be filtered, depending on Git settings.
  • If the operation "Store to Git Repository" is called for a "local" repository then objects are filtered to display only "local" objects in the tree.
  • If the operation "Store to Git Repository" is called for a "rollout" repository then objects are filtered to display only "rollout" objects in the tree.