リストタイムラインでミュートが貫通してしまう問題に対処 (#12534)

* ユーザリストTL系の各種動作を修正・統一

* fix

* fix CHANGELOG.md

* テスト追加

packages/backend/src/server/api/stream/Connection.ts

@@ -36,6 +36,7 @@ export default class Connection {
 	public userIdsWhoMeMuting: Set<string> = new Set();
 	public userIdsWhoBlockingMe: Set<string> = new Set();
 	public userIdsWhoMeMutingRenotes: Set<string> = new Set();
+	public userMutedInstances: Set<string> = new Set();
 	private fetchIntervalId: NodeJS.Timeout | null = null;
 
 	constructor(
@@ -69,6 +70,7 @@ export default class Connection {
 		this.userIdsWhoMeMuting = userIdsWhoMeMuting;
 		this.userIdsWhoBlockingMe = userIdsWhoBlockingMe;
 		this.userIdsWhoMeMutingRenotes = userIdsWhoMeMutingRenotes;
+		this.userMutedInstances = new Set(userProfile.mutedInstances);
 	}
 
 	@bindThis