Auto merge of #24123 - gterzian:redo_blob, r=jdm

Restructure Blob, structured serialization

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FIX #24052 and also address the "cloning" half of FIX #23917

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- [ ] `./mach test-tidy` does not report any errors
- [ ] These changes fix #___ (GitHub issue number if applicable)

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- [ ] These changes do not require tests because ___

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components/script/dom/document.rs

@@ -1916,6 +1916,9 @@ impl Document {
             let msg = ScriptMsg::DiscardDocument;
             let _ = global_scope.script_to_constellation_chan().send(msg);
         }
+        // https://w3c.github.io/FileAPI/#lifeTime
+        global_scope.clean_up_all_file_resources();
+
         // Step 15, End
         self.decr_ignore_opens_during_unload_counter();
     }