fix: ossl3 legacy provider mem leak

[jmayclin]

Resolved issues:

#4000

Description of changes:

s2n currently leaks memory when used with ossl3. This was originally discovered when I was futzing about with an attempt at cmake support for asan. Turns out it wasn't a false positive. Valgrind also reported the memory leak, which can be seen here

Running s2n_self_talk_tls12_test.c                         ... 
==4682== 5,627 (224 direct, 5,403 indirect) bytes in 1 blocks are definitely lost in loss record 82 of 85
==4682==    at 0x4C31B0F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==4682==    by 0x5074F18: CRYPTO_zalloc (mem.c:197)
==4682==    by 0x5080CCE: provider_new (provider_core.c:459)
==4682==    by 0x5080CCE: ossl_provider_new (provider_core.c:570)
==4682==    by 0x507DBFE: OSSL_PROVIDER_try_load (provider.c:26)
==4682==    by 0x151EE6: s2n_rc4_init (s2n_stream_cipher_rc4.c:39)
==4682==    by 0x125DB4: s2n_cipher_suites_init (s2n_cipher_suites.c:975)
==4682==    by 0x123F3D: s2n_init (s2n_init.c:76)
==4682==    by 0x11EE88: main (s2n_self_talk_tls12_test.c:110)
==4682== 

We have a different codepath involving loading a legacy provider to get rc4 support when using ossl3. It looks like that is leaking memory. @lrstewart Had a previous solution for rc4 support that involved just disabling rc4 support for ossl3, which is fine since it's use is explicitly banned by RFC 7465

This document requires that TLS clients and servers never negotiate the use of RC4 cipher suites.

This PR pulls in lrstewarts commits, and adds some integration test configuration that was needed to make them pass CI. It also adds CI jobs for openssl 3.

Testing:

I was able to test locally to confirm that the memory leak was no longer occuring in locally run ASAN jobs. I'll also manually add the new CI jobs to the CI for this PR.
By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[jmayclin]

The successful s2nGeneralBatch with openssl3 can be found in this CI run