Support comments in JSON files

[mlqn]

Description

Studio crashes if one of the JSON files contains a comment, an issue that has already been reported by some users.

https://github.com/Altinn/altinn-studio/assets/24462611/e6ed9013-1d23-4b3d-a53f-3d6d3d8094df

A solution proposed by @ivarne, already used by Team Apps, is to improve UX by supporting comments and skipping them during parsing using JsonCommentHandling.Skip.

new JsonSerializerOptions
{
    ReadCommentHandling = JsonCommentHandling.Skip,
}

We should also consider improving our error handling to give a more specific error message to users when a parsing issue occurs.

Additional Information

No response

[nkylstad]

We could skip comments during parsing to avoid Studio crashing. This will almost definitely result in a lot of questions as to why Studio is removing comments from json files though. App-lib code can do this, because they do not modify the files, but in Studio any change that causes f.ex. a layout-file with comments to update will then remove the comments.

The JSON specification does not allow for comments, as JSON is data only.

I guess our options are:

• Skip/ignore comments while parsing
• Warn user/show error if parsing fails because of comments. Is there a good way to do this?
• Combination of both? Ignore comments and inform user that they will be removed?

[ivarne]

Studio needs to add back the comments, just the same as it needs to add back the formatting when saving.