don't need disk caching for site data (#26333)

* reinstate

* start server manually

* routing tests too

* skip more

* sleep more and fail if not 200

* use e2etest for content/ too

* automatically start server for jest

* does this work?

* feedbacked

* rename things

* getting it to work

* add dev dependency

* install the right version

* don't need to start that

* fix package lock

* update readme about it

* feedbacked

* don't need disk caching for site-data

.github/workflows/test.yml

@@ -135,11 +135,6 @@ jobs:
       - name: Run build script
         run: npm run build
 
-      - name: Warm possible disk caching
-        env:
-          NODE_ENV: test
-        run: ./script/warm-before-tests.mjs
-
       - name: Run tests
         env:
           DIFF_FILE: get_diff_files.txt