fix: typo in clean messages periodical task's logging

[bowenliang123]

Summary

• fix typo in logging of Cleaned unused dataset to Cleaned messages in clean_message periodical task
• remove the unused variable page

Checklist

Important

Please review the checklist below before submitting your pull request.

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods

[bowenliang123]

cc @JohnJyong @laipz8200

[bowenliang123]

Hi @JohnJyong, may I ask for your advice to improve this PR? And what's the main reason for closing this PR?

[laipz8200]

Hi @bowenliang123. Sorry for close this PR directly, because this task is related to Cloud services. At the moment, we believe it does not require any changes.

[bowenliang123]

Thanks for keeping me informed.

Or may I strip changes and only fix the typo in logging, if you can reopen this PR ? Cleaned unused dataset is not correct in log text anyway.

[laipz8200]

only fix the typo in logging

SGTM.

[bowenliang123]

Thanks @laipz8200 . The code and the PR's description have been updated, narrowed to minor fix in logging text and unused variable. May I ask for a second round of review in this , @JohnJyong ?

[laipz8200]

LGTM

[laipz8200]

@JohnJyong and I reviewed this change together. Thank you for your contribution!

[bowenliang123]

Cool. I'm always glad to have Dify team's feedback and advices.