fix(dev): refresh generated interception rewrites

[bobu-putheeckal]

Closes #73803

Summary

• Remove stale generated interception rewrites before appending the current generated set in dev.
• Add a dev HMR regression test that renames an intercepted route and verifies the old rewrite no longer wins.

Testing

• PATH=./node_modules/.bin:/Users/c543982/.npm/_npx/179a5fd3f63fede5/node_modules/.bin:$PATH scripts/run-jest.sh --mode=dev --bundler=webpack --headless -- test/development/app-dir/interception-routes-rewrites-hmr/interception-routes-rewrites-hmr.test.ts
• git diff --check
• ./node_modules/.bin/prettier --check packages/next/src/server/lib/router-utils/setup-dev-bundler.ts test/development/app-dir/interception-routes-rewrites-hmr/interception-routes-rewrites-hmr.test.ts test/development/app-dir/interception-routes-rewrites-hmr/app/layout.js test/development/app-dir/interception-routes-rewrites-hmr/app/page.js 'test/development/app-dir/interception-routes-rewrites-hmr/app/@slot/(.)photo/page.js' test/development/app-dir/interception-routes-rewrites-hmr/app/@slot/default.js test/development/app-dir/interception-routes-rewrites-hmr/app/photo/page.js test/development/app-dir/interception-routes-rewrites-hmr/app/picture/page.js