Fix: Allow to delete unused tree ranks

[CarolineDenis]

Fixes #7102

Checklist

• Self-review the PR after opening it to make sure the changes look good and
  self-explanatory (or properly documented)
• Add relevant issue to release milestone
• Add pr to documentation list
• Add automated tests
• Add a reverse migration if a migration is present in the PR
• Add migration function to

  specify7/specifyweb/specify/management/commands/run_key_migration_functions.py

  Line 50 in ea04665

  def fix_schema_config(stdout: WriteToStdOut | None = None):

Testing instructions

Test #7102 (comment)

Follow up in #8310

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Reviewing files that changed from the base of the PR and between ab28095 and 1c69c7f.

📒 Files selected for processing (1)

• specifyweb/specify/models.py

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• Commit unit tests in branch issue-7102_07_base

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[CarolineDenis]

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[emenslin]

• Test #7102 (comment)

Looks good, no issues deleting tree ranks!

07-15_08.09.mp4