ADFA-4128 (4/11): drop the unused IQuickBuildHost.disconnect AIDL method

The runtime only ever disconnected by process death, which
ProxyAppConnections.onDisconnected already handles. Asked for in review on #1718.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Xsc7AMGBVyEMfrwpZX87iC

Author: fryanpan

quickbuild/runtime/src/main/aidl/com/itsaky/androidide/quickbuild/IQuickBuildHost.aidl

@@ -21,7 +21,4 @@ interface IQuickBuildHost {
 
 	/** The payload for {@code generation} crashed in render/lifecycle. */
 	oneway void reportCrash(long generation, String stackSummary);
-
-	/** Drop the registration for {@code packageName}, so CoGo stops sending it payloads. */
-	void disconnect(String packageName);
 }