feat(platform): Add React Router Framework platform in BE (#94157)

Author: chargome

src/sentry/models/project.py

@@ -105,6 +105,7 @@
     "javascript-gatsby",
     "javascript-nextjs",
     "javascript-react",
+    "javascript-react-router",
     "javascript-remix",
     "javascript-solid",
     "javascript-solidstart",

src/sentry/utils/platform_categories.py

@@ -6,6 +6,7 @@
     "dart",
     "javascript",
     "javascript-react",
+    "javascript-react-router",
     "javascript-angular",
     "javascript-angularjs",
     "javascript-backbone",