Move data refresh complete Slack message from ingestion server to catalog

[viktoriussuwandi]

Fixes

Fixes #2688 by @AetherUnbound

Description

Hi AetherUnbound,
just trying to help on this issue, please check it out

Update message on ingestion_server/ingestion_server/indexer.py

Update message on catalog/dags/data_refresh/reporting.py

Testing Instructions

Checklist

• My pull request has a descriptive title (not a vague title likeUpdate index.md).
• My pull request targets the default branch of the repository (main) or a parent feature branch.
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.
• I ran the DAG documentation generator (if applicable).

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[AetherUnbound]

Looks great, thanks so much for the contribution!