Bring back rust bindings path (#75620)

Ensures swc/turbopack don't fail to load in CI.

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Author: timneutkens

.github/workflows/rspack-nextjs-build-integration-tests.yml

@@ -28,6 +28,7 @@ env:
   NEXT_TELEMETRY_DISABLED: 1
   TEST_CONCURRENCY: 6
   NEXT_JUNIT_TEST_REPORT: 'true'
+  __INTERNAL_CUSTOM_TURBOPACK_BINDINGS: ${{ github.workspace }}/packages/next-swc/native/next-swc.linux-x64-gnu.node
   NEXT_TEST_SKIP_RETRY_MANIFEST: ${{ github.workspace }}/integration-test-data/test-results/main/failed-test-path-list.json
   NEXT_TEST_CONTINUE_ON_ERROR: TRUE
   NEXT_E2E_TEST_TIMEOUT: 240000

.github/workflows/rspack-nextjs-dev-integration-tests.yml

@@ -28,6 +28,7 @@ env:
   NEXT_TELEMETRY_DISABLED: 1
   TEST_CONCURRENCY: 6
   NEXT_JUNIT_TEST_REPORT: 'true'
+  __INTERNAL_CUSTOM_TURBOPACK_BINDINGS: ${{ github.workspace }}/packages/next-swc/native/next-swc.linux-x64-gnu.node
   NEXT_TEST_SKIP_RETRY_MANIFEST: ${{ github.workspace }}/integration-test-data/test-results/main/failed-test-path-list.json
   NEXT_TEST_CONTINUE_ON_ERROR: TRUE
   NEXT_E2E_TEST_TIMEOUT: 240000