[Fix] (Espryt, State): let the last four object classes announce their own death and delete the twin table's garbage collector

- e2 was landed for two of six kinds, so Texture, Framebuffer, SamplerCso and
  VertexElementsCso still discovered death in a sweep and ROADMAP.md:18's "delete the GC"
  was undelivered. TextureObjectBase (the one base every concrete texture derives from),
  FramebufferObject, SamplerObject and VertexArrayObject now raise
  NotifyStateObjectDestroyed from their destructor, on RenderbufferObject's pattern: out of
  line, declared only under MOBILEGL_PIPE_PUSH, so the pull build keeps its implicit
  destructor and its symbol set (G1 still 0 added / 0 removed / 0 renamed and 0 resized
  against p2/contract).
- With all six announcing, BackendSlotTable loses BOTH sweep drivers: no draw tick, no
  creation tick, no kGCInterval / kCreationGCInterval / m_gcTick / m_creationTick.
  CollectGarbageIfNeeded() is empty on this arm; CollectGarbageNow() stays as an EXPLICIT
  collection and is the backstop for a notice that InProcessTeardown() drops.
- The seven CollectGarbageIfNeeded call sites in DirectGLES.cpp keep their spelling because
  they are the legacy registry's driver and that arm is still compiled beside this one; the
  registry's body is now guarded on MOBILEGL_PIPE_LEGACY_MEMOS, so a build without the
  legacy arm has no collector at all. On the handle arm each site is a predicted branch.
- The weak_ptr per entry stays for exactly two jobs it is honest about: ForEachLive()'s
  strong hand-over to ScopedDetachedTextureFramebufferAttachments, and the explicit
  collection. It is never an identity test; Gen is.
- Tests: AProgramAndARenderbufferAnnounceTheirOwnDeath becomes
  EveryReKeyedObjectClassAnnouncesItsOwnDeath and drives all six classes, by membership
  rather than count because every texture owns a private sampler that also announces;
  ObjectChurnAloneDrivesTheSweep becomes
  AnnouncedDeathKeepsObjectChurnFromAccumulatingWithoutASweep and pins that 256 churned
  objects hold one live twin at a time with no CollectGarbage* call anywhere.

MobileGL/MG_Backend/DirectGLES/Managers.h

@@ -451,6 +451,12 @@ namespace MobileGL::MG_Backend::DirectGLES {
         }
 #endif
 
+        // The seven DirectGLES.cpp call sites drive the LEGACY arm and nothing else. On the
+        // handle arm death is announced by the frontend object's destructor
+        // (MG_State/GLState/StateObjectDeathNotice.h), so there is no garbage to collect on a
+        // tick and this is the predicted branch plus a return - which is how ROADMAP.md:18's
+        // "delete the GC" is delivered without deleting the legacy arm's own collector while
+        // that arm is still compiled beside it.
         void CollectGarbageIfNeeded() {
 #if MOBILEGL_PIPE_PUSH
             if (EsprytSlotTablesEnabled()) {
@@ -458,12 +464,14 @@ namespace MobileGL::MG_Backend::DirectGLES {
                 return;
             }
 #endif
+#if MOBILEGL_PIPE_LEGACY_MEMOS
             ++m_gcTick;
             if (m_gcTick < kGCInterval) {
                 return;
             }
             CollectGarbage();
             m_gcTick = 0;
+#endif
         }
 
         void CollectGarbageNow() {