dynamicVRAM + --cache-ram 2 (CORE-117) (#13603)

* pinned_memory: remove JIT RAM pressure release

This doesn't work, as freeing intermediates for pins needs to be
higher-priority than freeing pins-for-pins if and when you are going
to do that. So this is too late as pins-for-pins is model load time
and we dont have JIT pins-for-pins.

* cacheing: Add a filter to only free intermediates from inactive wfs

This is to get priorities in amongst pins straight.

* mm: free inactive-ram from RAM cache first

Stuff from inactive workflows should be freed before anything else.

* caching: purge old ModelPatchers first

Dont try and score them, just dump them at the first sign of trouble
if they arent part of the workflow.

execution.py

@@ -779,7 +779,7 @@ class PromptExecutor:
 
                     if self.cache_type == CacheType.RAM_PRESSURE:
                         comfy.model_management.free_memory(0, None, pins_required=ram_headroom, ram_required=ram_headroom)
-                        comfy.memory_management.extra_ram_release(ram_headroom)
+                        ram_release_callback(ram_headroom, free_active=True)
                 else:
                     # Only execute when the while-loop ends without break
                     # Send cached UI for intermediate output nodes that weren't executed