remove IIFEs in preparation for ES module refactor

app/assets/javascripts/abuse_reports.js

app/assets/javascripts/activities.js

app/assets/javascripts/admin.js

app/assets/javascripts/api.js

app/assets/javascripts/aside.js

app/assets/javascripts/autosave.js

app/assets/javascripts/breakpoints.js

app/assets/javascripts/broadcast_message.js

app/assets/javascripts/build.js

app/assets/javascripts/build_artifacts.js

app/assets/javascripts/ci_lint_editor.js

app/assets/javascripts/commit.js

app/assets/javascripts/commits.js

app/assets/javascripts/compare.js

app/assets/javascripts/compare_autocomplete.js

app/assets/javascripts/confirm_danger_modal.js

app/assets/javascripts/copy_as_gfm.js

app/assets/javascripts/copy_to_clipboard.js

app/assets/javascripts/create_label.js

app/assets/javascripts/diff.js