chore: remove four modules nothing in the app uses (#1403)

* chore: remove four modules nothing in the app uses

src/app/sourceSlot.js re-exported src/sources/sourceSlot.js, which every
caller imports directly. src/data/flowTiles.js and src/data/issPass.js were
reached only by their own tests. src/data/localGeojson.js wrapped
localGeojsonCore.js with the app's services, which the catalog already
passes itself. The local GeoJSON layer tests now build layers the way the
catalog does, so they keep covering localGeojsonCore.js; only the test of
the wrapper's own default host goes. Boundary lists, format scope and docs
drop the removed paths.

* docs: changelog for #1403

scripts/format-scope.json

@@ -518,7 +518,6 @@
   "src/layers/bikeshare/selection.js",
   "src/data/traffic.js",
   "src/data/bikeshare.js",
-  "src/data/flowTiles.js",
   "src/layers/traffic/source.test.mjs",
   "src/layers/bikeshare/source.test.mjs",
   "src/layers/bikeshare/proxyRoute.test.mjs",
@@ -651,7 +650,6 @@
   "src/agent/worldPacket.test.mjs",
   "src/voice/layerSummary.js",
   "build/application-html.js",
-  "src/app/sourceSlot.js",
   "src/app/sources.js",
   "src/ui/composition.js",
   "src/services/application.js",