perf: Drop district/subdistrict dropdown queries, derive both from the existing map-data features

The analytics map view fires four queries that overlap:

• districtMapData: GeoJSON, whose features include each district's code and name
• revCircleMapData: GeoJSON, whose features include each revcircle's code, name, and parent district's district-code
• getDistrictRevCircle({ type: "district", code }): [{ district: name, code }, …], populates the district dropdown
• getDistrictRevCircle({ type: <subdistrict-type>, code }): { <districtName>: [{ <typeSlug>: name, code, district_code }, …] }, populates the revenue-circle dropdown (grouped by district name)

The two getDistrictRevCircle calls run the same layer_geography joins as the map queries, doubling query time on cold cache.

Proposed change: Derive dropdowns from map features, and remove getDistrictRevCircle (which also has an India-specific name).

Affects:

• app/[locale]/[state]/analytics/components/analytics-layout.tsx: remove districtGeographiesData and revenueGeographiesData useQuery calls and their consumers. Replace the consumers with:
  • District dropdown: read code and name from districtMapData.features[].properties.
  • Subdistrict dropdown: read code, name, and district-code from revCircleMapData.features[].properties, then group by district name using a district-code to name lookup built from districtMapData.features (already loaded).
• app/[locale]/[state]/analytics/components/analytics-mobile-layout.tsx: same idea
• app/[locale]/[state]/analytics/components/filter-component.tsx: same idea
• config/graphql/analaytics-queries.ts: remove the getDistrictRevCircle query definition.
• tests/analytics-layout.test.tsx, tests/filter-component.test.tsx, tests/analytics-mobile-layout.test.tsx: replace getDistrictRevCircle fixtures with equivalent districtMapData or revCircleMapData feature fixtures.

Backend:

• layer/schema.py: remove get_district_rev_circle and its Query.get_district_rev_circle field.

Start in the three analytics layout/filter components and inspect the existing districtMapData and revCircleMapData feature properties. Run tests/analytics-layout.test.tsx, tests/filter-component.test.tsx, and tests/analytics-mobile-layout.test.tsx while replacing the listed fixtures, then check config/graphql/analaytics-queries.ts and layer/schema.py. Done means the dropdowns use map features, getDistrictRevCircle is removed, and the affected tests pass.