Nix Improvements

[harrisonkaiser]

Problem:

With #3824 merged, there are several open problems that need addressing

Not all integ tests run in the dev shell for all platforms

• cross_compatibility. This depends on s2nc_head and s2nd_head, which we don't provide, yet.
• renegotiate_apache. Translate apache2 to apachectl (nix can do the apache config)
• sslyze is only available on x86 with <python3.11, (affecting other upgrade efforts)

Tests that are flaky on arm

• happy_path
• ocsp
• record_padding
• renegotiate
• session_resumption
• signature_algorithms
• version_negotiation

Not all integ tests work on arm

• Use pytest to retry flaky tests
• Root cause the failures and iterate on addressing the issues
• Add aws-lc with fips module to the libcrypto list
• Move all test infrastructure inside CMake This is tracked elsewhere, and is underway. (e.g. Valgrind and asan )

Requirements / Acceptance Criteria:

What must a solution address in order to solve the problem? How do we know the solution is complete?

The nix shell is used by developers and the CI and the the codebuild/bin directory can be removed.

[dougch]

2/3 of the aarch64 PRs merged: #4045 and #4043