Async question images, saveToChatbot, and source document citations

[AdamFipke]

Update:

Here's a list of my TODOs that I was going to include in this PR ('cause I was banging out features at the time). I split these into ones that could be put into their own PR and what's left that absolutely needs to be done for this PR. DO NOTE that I have not looked at this PR in a minute, so some things may be partially implemented or already done, but probably not.

Possibly their own PR:

• Post response image upload (should probably use AI to generate alt text)
• Images for comments (which includes editing and deleting images. A lot of the work for this can just be copy-pasted from what was done here, including using AI to generate alt texts)
• Image upload for chatabot (I think I already made this an issue, here Image upload for chatbot #286 )

What's left for this PR:

• actually log a question.images.buffer after querying to make sure its undefined and not being loaded into memory (this is just to test to make sure @Exlclude or whatever is working
• Manually test all places with API.asyncQuestions.studentUpdate and make sure they still work as intended
• Give option for staff to delete any citations from the AI (checkbox) - I think I already did this
• Try adding an image while editing without checking "Get a new AI response" and make sure it doesn't fail
• Update userguide
• Don't forget to handle case about the course setting for asyncCentreAIAnswers - I may have already done this but not sure. Should manually test to make sure it works well
• update cloneCourseDocuments to include the new types of documents
• TESTS, i haven't yet wrote any tests for this I believe. And tests are really important in this case since this actually allows for students to upload images/files (and said images/files will get processed by chatbot). So making sure the file size limit, extension checks, and everything actually work. The chatbot side of the image upload (for /ask) probably already has a fair bit of tests from bridgette, but I would probably write proper tests for this and to also probably mock the chatbot service's response.
• Maybe add a visual way to show if an anytime question has already been inserted as a chunk, if there isn't already. (It has been so long I have forgotten if I already did this, I think I have)

Description

Still need to write this, though I wrote pretty detailed commit messages

Closes # (issue number)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• This requires a run of yarn install
• This change requires an addition/change to the production .env variables. These changes are below:
• This change requires developers to add new .env variables. The file and variables needed are below:
• This change requires a database query to update old data on production. This query is below:

How Has This Been Tested?

Please describe how you tested this PR (both manually and with tests)
Provide instructions so we can reproduce.

• Test A
• Test B

Checklist:

• I have performed a self-review of my own code
• I have commented my code where needed
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any work that this PR is dependent on has been merged into the main branch
• Any UI changes have been checked to work on desktop, tablet, and mobile