Add warning for too-long dialog

[mjpost]

If the metadata query is too long, it cannot be filed to Github over a GET request. This PR just adds a note to the user.

[github-actions]

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[nschneid]

WFM with https://aclanthology.org/2021.tacl-1.66/ (https://preview.aclanthology.org/remove-affiliations/2021.tacl-1.66)

[nschneid]

How was the 2000 character limit chosen? I'm seeing manual requests for lists of <10 authors that I'm pretty sure would have worked in the dialog before we made this change.

[mjpost]

Yeah, this is causing problems. I'm going to revert it until we can find the actual cutoff. I remember digging around for this number.

[nschneid]

If you set it to 10000 or something I can experiment with it on the client side.

[mbollmann]

Also, what issue URL should we direct people to when they hit the limit? Opening a blank issue doesn't seem ideal given that we have issue templates for everything (and they automatically get tagged appropriately), but the "paper metadata" one specifically says not to use it manually.

[mjpost]

Yeah, this is more complicated than I'd thought.

The situation I want to save people from is this: you go to all the work manipulating the form, submit—and you get an error on the Github side. You've done a bunch of work for nothing.

I think we should figure out the limit, set the threshold short of that, and guide the user through the following:

• Present the JSON data structure in the dialog, along with a copy to clipboard button
• Give them a link to the issue template, with just a minimal URL string
• Instruct them to manually paste the complete JSON block into the issue