Add batch actions for reports in admin UI

[Gargron]

• Add ability to close reports in bulk
• Add ability to assign reports to self in bulk
• Add ability to filter reports by category
• Add ability to filter reports by which server they originated from
• Add responsive design for smaller screens
• Spell out which name is the reporter and which name is the assigned moderator for clarity
• Spell out number of posts and attachments instead of using one-off icons that are not used elsewhere
• Display report ID
• Display report category
• Display how long the report has been waiting
• Display who took action on the report

Desktop	Mobile

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Fix #29023, fix #26208, fix #31234, fix #32376

[ThisIsMissEm]

So there's a reason we shouldn't do this, and that's because the reports list view absolutely does not give enough information to resolve reports. You have no way of knowing what posts were included, why they were reported, etc.

I've also already been addressing #31234 in #31449

I didn't tackle #26208 yet because report categorisation is currently non-existent for non-local reports (see: swicg/activitypub-trust-and-safety#2 ), so the filters of "spam" for reports from remote instances would always show up nothing.

[ThisIsMissEm]

I've also already been working on a redesign of the reports list in #31557 with getting UX people involved to try to make things better.