Refactor IdentifiersInput Vue component to not need isEdition checks

[cdrini]

I think we can remove all the references to isEdition (or similar) from this code. Most of the logic was just checking for saveIdentifiersAsList , and now that that abstraction has come out, I think these can be cleared up as well! Instead of edition_popular, we can just have a popular_ids="['project_gutenberg', 'isbn']" and so on. This doesn't have to be edition-specific, and can just be a list of identifiers to be extracted from the pool of identifiers to be listed at the top. And then you can just check if there are any popular identifiers.

(Addendum of #10032)

Relevant Files

https://github.com/internetarchive/openlibrary/blob/master/openlibrary/components/IdentifiersInput.vue

Stakeholders

@schu96

[schu96]

@cdrini I'd like to be assigned to this issue

[cdrini]

Awesome, thank you @schu96 !