fix(dummy_diag_publisher): not use diagnostic_updater and param callback

[h-ohta]

Description

• diagnostic_updaterを使用するとdiagのnameにノード名が入ってしまうため、自前でpublishする形に変更する
• param callbackを削除する
  • 正常に動いていなかったため、
  • パラメータでdefaultを設定する都合上、正常に動いたとしてもdefault指定の場合はパラメータを変更できないため

Related links

https://tier4.atlassian.net/browse/RT0-31356

Tests performed

https://github.com/tier4/autoware_launch.x2/pull/641 と一緒に確認する

Notes for reviewers

Interface changes

Effects on system behavior

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[ito-san]

@h-ohta LGTMなんですが、pre-commit.ciで関係ないところでエラーが出てますね...

[h-ohta]

@ito-san このPRで直すのもおかしいので、別でPR作ります

[h-ohta]

@ito-san 無事CIが通ったみたいですね