test: properly gate some cache-component tests (#100828)
Don't use `decribe.skip`, so that these tests at least still run in the
non-cache-components mode.
Except for 3 files, these were already listed in
test/cache-components-tests-manifest.json
I am confused whether we are supposed to use `@gate` or that manifest
now. But that is another preexisting question
This hid the failure in https://github.com/vercel/next.js/pull/100830
