Add Publication Creation Dropdown to Publications Page

[gmeben]

Currently, the only way to create a publication is to use the Admin-only Publications page (/admin/publications). This is inconvenient for admins who may not be aware of this page or how to discover/access it.

Add the publication creation dropdown that appears on the admin-only page to the Publications page. Show this conditionally so that only publication admins and application admins can see this component.

Review Checklist

• An application administrator can create a publication from the Publications page
• A publication administrator can create a publication from the Publications page
• Necessary backend unit testing has been added
• Necessary frontend unit testing has been added
• Necessary integration testing has been added
• Documentation has been updated to reflect new changes

Accessibility Checklist

• No new color contrast issues are introduced
• Changed text has a font size of at least 16px
• Changed text uses plain language

[gmeben]

Feature Request: https://feedback.pilcrow.dev/posts/6/create-publication-from-publications-page

[sattler9]

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