Add soft delete to LTI sections

[carl-codeorg]

Adds soft-delete to LTI sections. Adding the paranoid behavior messed up some of the cascading deletes, mostly because of the way that we were trying to get deleting a section to delete the LTI section, and vice versa. The only working solution I could find was:

• removing the dependent: :destroy from the has_many :sections through: :lti_sections relationship in LTI Courses. Deleting the LTI course will delete the LTI section, which in turn will delete the section, so the additional destroy was redundant.
• Removing the dependent: :destroy on both sides of the one-to-one relationship between sections and LTI sections. Instead, I added separate methods in each model to delete the corresponding other record. Without doing this, I ended up with endless loops when the two records tried to delete each other.

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PR Checklist:

• Tests provide adequate coverage
• Privacy and Security impacts have been assessed
• Code is well-commented
• New features are translatable or updates will not break translations
• Relevant documentation has been added or updated
• User impact is well-understood and desirable
• Pull Request is labeled appropriately
• Follow-up work items (including potential tech debt) are tracked and linked