[Iteration 1]Merge spring 24 main to snp-cloud main

Checklist

[x] I have read the Contribution & Best practices Guide.
[x] My branch is up-to-date with the upstream master branch.
[x] The tests pass locally with my changes.
[x] I have added tests that prove my fix is effective or that my feature works(if appropriate).
[x] I have added necessary documentation (if appropriate).

Short description of what this resolves/which issues does this fix?:

Changes proposed in this pull request:

changes attribute 'submission instructions' to 'submission template' for event_types model. Changed corresponding view, controller, model, and testing code.
Makes it such that no user (admins, non-admins) can see these toggles. An admin is still able to change these settings by going to administration->users->edit. The button for admin has also been updated from a checkbox to a toggle switch.
Update the INSTALL_SNAPCON.md to provide instruction to the situation of fork safty issues from MacOS

snap-cloud / snapcon