Removed all jQuery AJAX calls and replaced with our fetch wrapper.
Tested the following functionalities and they work as before:
- due-date update
- comment deletion
- branch update by merge or rebase
- allow edits from maintainers button
- reviewer addition or deletion
- WIP toggle button
- new diff code comment button
- issue title edit button
# Demo using `fetch` instead of jQuery AJAX
## Updating the due-date of an issue
## Deleting a comment
## Updating a branch in a pull request
## Checking and unchecking the "Allow edits from maintainers" checkbox
## Requesting review and removing review request
## Toggling the WIP status of a pull request
## Clicking the new code comment button on the diff page
## Editing the issue title and target branch
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Signed-off-by: Yarden Shoham <git@yardenshoham.com>
Co-authored-by: silverwind <me@silverwind.io>
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