Remove spring-boot-smoke-test-webflux-ssl

Remove `spring-boot-smoke-test-webflux-ssl` since it's more of
an integration test than a smoke test. We could consider
relocating it to `spring-boot-integration-tests` but since we
have unit tests with a mock PCKCS11 security it's probably
best to see if we can get away without it.

See gh-32179