Fixes test for Gemfile entry changes

Broken by fbe38c9e9d4fe9f82518e8ffc1d757459b0c5f1c
Merge pull request #16429 from arunagw/aa-build-fix-gemfile-spring

Fixes test for Gemfile entry changes
add a test for prepending SCRIPT_NAME to generated urls
save a hash allocation per request.
Add config option for cookies digest

You can now configure custom digest for cookies in the same way as `serializer`:

config.action_dispatch.cookies_digest = \SHA256'
Return preconfigured AS::MessageVerifier
Merge pull request #16434 from strzalek/cookies-digest-config-option

Add digest config option for SignedCookiesJar
Merge branch 'master' of github.com:xuchu/rails