Unify node image for integration tests

[slimreaper35]

We use various versions of node images for npm, yarn classic, yarn berry, and pnpm integration tests. That is unnecessary, and we can reduce the number of images that are being pulled.

Make sure corepack is included for yarn berry.

[eskultety]

Make sure corepack is included for yarn berry.

IOW, the max. allowed version for the moment (until we figure out what to do with corepack) is Node 24.