[AIRFLOW-3835] Remove DagBag from /task.

[jrderuiter]

Make sure you have checked all steps below.

Jira

• My PR addresses the following Airflow Jira issues and references them in the PR title. For example, "[AIRFLOW-XXX] My Airflow PR"

  • https://issues.apache.org/jira/browse/AIRFLOW-3835

Description

• Here are some details about my PR, including screenshots of any UI changes:

Removes dependency on dagbag in the rendered endpoint, similar to earlier PR's such as #4831.

Tests

• My PR adds the following unit tests OR does not need testing for this extremely good reason:

Covered by existing tests.

Commits

• My commits all reference Jira issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "How to write a good git commit message":
  1. Subject is separated from body by a blank line
  2. Subject is limited to 50 characters (not including Jira issue reference)
  3. Subject does not end with a period
  4. Subject uses the imperative mood ("add", not "adding")
  5. Body wraps at 72 characters
  6. Body explains "what" and "why", not "how"

Documentation

• In case of new functionality, my PR adds documentation that describes how to use it.

Not applicable.

Code Quality

• Passes flake8

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[jrderuiter]

Stale.