Rework show-schedule, DB migration to correct core tasks, 4.7 upgrade guide and other documentation updates

[Mark90]

Changes:

• Add DB migration 2025-12-10_9736496e3eba_set_is_task_true_on_certain_tasks.py to correct core tasks which were incorrectly configured as workflows, causing them to not show up in the UI
• Change show-schedule command for readability and helping users tell the source of schedules

Example output show-schedule:

Documentation related:

• Add 4.7 upgrade guide for Scheduler/Workflow Auth changes
• Several updates regarding deprecations and pending removals for upcoming 5.0.0 release
• In the [docs] dependencies, downgrade click from 8.3.1 to 8.2.1 to fix mkdocs serve not hot-reloading anymore (is fixed in click but release date is unclear)
• Improved the CLI Tools section for clarity, extended scheduler subcommand documentation
• In the Authorization and Workflows section, corrected the auth callback parameter names to have the _callback suffix
• Added support for BETA and DEPRECATED markers in documentation headings without breaking URL anchors

[codspeed-hq]

CodSpeed Performance Report

Merging #1286 will not alter performance

_{Comparing additions-for-4.7.0rc1 (438cba3) with main (f19a201)}

Summary

✅ 13 untouched

[sentry]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.26%. Comparing base (f19a201) to head (438cba3).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1286      +/-   ##
==========================================
+ Coverage   80.23%   80.26%   +0.02%     
==========================================
  Files         274      274              
  Lines       13551    13567      +16     
  Branches     1330     1330              
==========================================
+ Hits        10873    10889      +16     
  Misses       2376     2376              
  Partials      302      302              

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