EGL Multifile Blobcache: Clean up key reuse

This CL contains multiple fixes that allow key reuse.

* set() now checks whether an entry is already present, and if so
  removes it from hotcache and tracking before adding them.
* trackEntry and removeEntry now update the total cache size.
* applyLRU now correctly removes entries from all tracking.

Additional tests:
* SameKeyDifferentValues
* SameKeyLargeValues

Based on work by: Igor Nazarov <i.nazarov@samsung.com>

Test: libEGL_test, EGL_test, ANGLE trace tests, apps
Bug: b/351867582, b/380483358
Flag: com.android.graphics.egl.flags.multifile_blobcache_advanced_usage
Change-Id: I66fe9cde18e468e541a80296c80f2234ac61acb0