Link between dags and variables

### Description
For airflow v3.0.6
Firstly, is that possible to add a feature to directly jump to/view the DAG's respective variable definition instead of searching for it if the dag is tagged to a variable?

Secondly, the scheduled time in the UI doesn’t update when I change the timezone. and show the timezone reference.

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### Use case/motivation

_No response_

### Related issues

_No response_

### Are you willing to submit a PR?

- [ ] Yes I am willing to submit a PR!

### Code of Conduct

- [x] I agree to follow this project's [Code of Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)

The issue names no files, tests, or entry points. First clarify whether both the DAG-to-variable navigation request and the timezone display request are in scope, then locate the relevant Airflow UI entry points and tests. Done means each agreed behavior works in Airflow 3.0.6 and has coverage for the timezone reference and updated scheduled time.

Written by the indexing model from the issue text.