Append concurrency tag to prevent issues between DAGs in staging

[krysal]

Fixes

Fixes #5128 by @stacimc

Description

This PR adds the missing STAGING_DB_CONCURRENCY_TAG to the staging data refresh DAG to prevent it from running with conflicting DAGs like the staging database restore.

It also gives the index of the wait_for_external_dag mapped tasks a friendlier name than the default numbers. Now it shows the DAG id being checked.

Testing Instructions

1. Spin up the catalog and API stack ov just c && ov just a
2. Run the staging_<media>_data_refresh DAGs and observe the checks for the conflicting DAGs are in place.

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 (ov just catalog/generate-docs for catalog PRs) or the media properties generator (ov just catalog/generate-docs media-props for the catalog or ov just api/generate-docs for the API) where applicable.

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