CDRIVER-4495 Test crypt_shared with older server versions (#1169)

* remove unused USE_CRYPT_SHARED expansion

* add SKIP_CRYPT_SHARED_LIB expansion

* rename asan-ubuntu-without-csfle to asan-ubuntu-with-mongocryptd

* sync download-mongodb.sh to 1d7119eeb531e7fab60423e803a94f4a2f61ec0f

* remove GENERIC_LINUX_URL check

It does not provide much value. Calling get_mongodb_download_url_for now errors if a download is unavailable.
Alternatively, this check can be limited to server versions < 4.2.