potential save course fix

[plumshum]

Summary

• default collection functionality changed
• courses in default collection can only be removed by specifically removing that course from the default collection

This pull request is the first step potentially fixing save Courses default collection functionality

Test Plan

• If no specific collection is chosen, then a course is only saved to the 'All/default collection'
• If a course is deleted from 'All/default collection', then every instance of that course is deleted from the specific collections
• Note: if a course is removed from any instance from the specific collections, that course will still remain in the 'All/default collection`
• There should never be any duplicate courses in a particular collection.

Notes

May not change the functionality based on future user reviews

Blockers

• A newly discovered dependency that hasn’t been addressed

Breaking Changes

• Database schema change (anything that changes Firestore collection structure)
• Other change that could cause problems (Detailed in notes)

[dti-github-bot]

[diff-counting] Significant lines: 21.

[github-actions]

Visit the preview URL for this PR (updated for commit f00b29a):

https://cornelldti-courseplan-dev--pr964-savedcourses-fixes-hpuztrf4.web.app

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[nidhi-mylavarapu]

I know this is a draft PR so there are still some more fixes but great progress so far!! thanks so much for being on top of it!

[nidhi-mylavarapu]

Just to clarify the functionality:
anytime you save any course, it should end up in the "all" collection, whether you add it to another specific collection or not?

[nidhi-mylavarapu]

Also, on a completely separate note, should the other drop downs for collections close if you open a different one? That is, is it possible for all of the collection drop downs to be open at the same time?