chore(tsconfig): move "jsx" flag from tsconfig.build.json to tsconfig.build.json

packages/ra-cubicweb/tsconfig.build.json

 {
   "extends": "./tsconfig.json",
   "compilerOptions": {
-    "outDir": "dist",
-    "jsx": "react"
+    "outDir": "dist"
   },
   "include": ["./src"],
   "exclude": ["**/__tests__"]

packages/ra-cubicweb/tsconfig.json

 {
-  "extends": "../../tsconfig.json"
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "jsx": "react"
+  },
 }