Closes #14643

Steps to test

Mandatory checks

• I own the copyright of the code submitted and I license it under the MIT license
• I manually tested my changes in running JabRef (always required)
• I adjusted existing JUnit tests
• I added screenshots in the PR description (if change is visible to the user)
• I described the change in CHANGELOG.md in a way that is understandable for the average user (if change is visible to the user)
• I checked the user documentation: Is the information available and up to date? If not, I created an issue at https://github.com/JabRef/user-documentation/issues or, even better, I submitted a pull request updating file(s) in https://github.com/JabRef/user-documentation/tree/main/en.

Observation during development:

I want to point out a possible issue with sorting order that is visible on the picture. Right now, sorting order of elements in dropbox is case sensitive (meaning that the order of elements is ABCabc, and it probably should be AaBbCc)

This is because of sorting method implemented here. I'm not sure if this a bug or not, just wanted to point it out because previously 'ArXiv' was at the top of the list, right now it's going to be closer to the bottom so this potentially could influence UI/UX experience just a little bit but idk.

The possible fix is smth like:

SortedSet<IdBasedFetcher> set = new TreeSet<>(Comparator.comparing(
        WebFetcher::getName,
        String.CASE_INSENSITIVE_ORDER
));

but technically, this is not the scope of the issue, so i'm keeping it as it is.