feat(world-map): migrate World Map plugin to the v1 chart data API

[Naktibalda]

SUMMARY

Migrates the World Map chart from the deprecated legacy data endpoint (/superset/explore_json/) to the v1 chart data API (POST /api/v1/chart/data), and renames the package
@superset-ui/legacy-plugin-chart-world-map → @superset-ui/plugin-chart-world-map (1.0.0), following the precedent set by preset-chart-deckgl in #38035.

Rationale: besides moving one more chart off the deprecated endpoint, this fixes World Map charts in embedded dashboards: /superset/explore_json/ rejects guest tokens unconditionally, so embedded
users get "Access is Denied" on every World Map chart while all v1-API charts on the same dashboard work.

Design decisions:

• buildQuery replicates the legacy WorldMapViz.query_obj (superset/viz.py) exactly: group by the entity column, request the metric plus the bubble-size metric when distinct (compared via
  getMetricLabel, so adhoc metrics dedupe correctly), and translate sort_by_metric into an orderby.
• The v1 endpoint returns generic rows keyed by the entity column and metric labels, so transformProps now rebuilds the country/code/name/latitude/longitude/m1/m2 shape the renderer consumes — the
  country-code conversion and centroid/name enrichment that WorldMapViz.get_data performed server-side via superset/examples/countries.py. The country table is mirrored client-side (src/countries.ts,
  case-insensitive lookup like the Python get()), including the legacy m2 = m1 fallback and the XXX sentinel for unmappable values.
• The world_map viz key is unchanged, so existing charts keep working without migration. Existing charts should be re-saved (Save → overwrite) to refresh their stored query_context before use behind guest
  tokens, since the guest query_context_modified check compares against it.
• The legacy WorldMapViz Python class is intentionally left in place; it can be removed in a follow-up together with the other explore_json cleanups.
• Rendering (WorldMap.ts/datamaps) is untouched — no visual changes.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

No visual changes — same renderer, new data path. (Before/after of an embedded dashboard: previously "Access is Denied" on World Map charts under a guest token, now rendering.)

TESTING INSTRUCTIONS

1. Open any World Map chart (e.g. from the World Bank's Data example dashboard) in Explore and on a dashboard: choropleth, bubbles (enable "Show Bubbles" with a secondary metric), tooltips, color-by
   country/metric, cross-filtering and drill-to-detail/drill-by all behave as before.
2. In the network tab, confirm the chart now fetches via POST /api/v1/chart/data (no /superset/explore_json/ request).
3. Verify each country_fieldtype option still maps correctly (cca2/cca3/cioc/full name), including lower-cased values, and that unmappable values are simply omitted from the map.
4. Embedded regression: with EMBEDDED_SUPERSET enabled, embed a dashboard containing a World Map chart and render it with a guest token — the chart loads (previously failed with "Access is Denied"). Re-save
   the chart first if it existed before this change.
5. Unit tests: npm run test -- plugins/plugin-chart-world-map (new buildQuery/transformProps suites plus the existing renderer suite).

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

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[codecov]

Codecov Report

❌ Patch coverage is 97.22222% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 65.29%. Comparing base (67924ad) to head (80378cf).
⚠️ Report is 11 commits behind head on master.

Files with missing lines	Patch %	Lines
...ugins/plugin-chart-world-map/src/transformProps.ts	94.44%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #42356      +/-   ##
==========================================
+ Coverage   65.28%   65.29%   +0.01%     
==========================================
  Files        2793     2795       +2     
  Lines      157260   157295      +35     
  Branches    35955    35972      +17     
==========================================
+ Hits       102660   102702      +42     
+ Misses      52623    52616       -7     
  Partials     1977     1977              

Flag	Coverage Δ
javascript	71.22% <97.22%> (+0.02%)	⬆️

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