DEV: Convert AdminReport component to gjs (#31011)

This commit converts the `AdminReport` component, which is quite
high complexity, to gjs. After this initial round, ideally this
component would be broken up into smaller components because it is
getting quite big now.

Also in this commit:

* Add an option to display the report description in a tooltip, which
was
   the main way the description was shown until recently. We want to use
   this on the dashboard view mostly.
* Move admin report "mode" definitions to the server-side Report model,
inside a `Report::MODES` constant, collecting the modes defined in
various
   places in the UI into one place
* Refactor report code to refer to mode definitions
* Add a `REPORT_MODES` constant in JS via javascript.rake and refactor
  JS to refer to the modes
* Delete old admin report components that are no longer used
  (trust-level-counts, counts, per-day-counts) which were replaced
  by admin-report-counters a while ago
* Add a new `registerReportModeComponent` plugin API, some plugins
   introduce their own modes (like AI's `emotion`) and components and
   we need a way to render them

docs/CHANGELOG-JAVASCRIPT-PLUGIN-API.md

@@ -7,6 +7,10 @@ in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [2.0.1] - 2025-01-29
+
+- Added `registerReportModeComponent`. This allows plugins to register different report display modes in addition to the built-in core ones like `chart`, `table`, and so on defined in `Report::MODES`.
+
 ## [2.0.0] - 2025-01-07
 
 - Removed `decorateTopicTitle`. This has been deprecated for more than a year, and we are not aware of any remaining uses in the ecosystem.