Adds CI check against latest AWS-LC commit

[geedo0]

Issue #, if available: 2907583

Description of changes:

This PR adds continuous integration testing against the latest AWS-LC commit to proactively detect compatibility issues. ACCP's CI testing previously only built against a pinned AWS-LC submodule commit. This meant potential integration failures with newer AWS-LC releases were discovered asynchronously and out-of-band, making them harder to track and address.

Adds a --latest-awslc flag to the run_accp_basic_tests.sh CI script that:

• Clones the main branch of AWS-LC at test time instead of using the checked-in submodule
• Overrides the CMake build to use the freshly cloned AWS-LC source
• Enables testing against the tip of AWS-LC to catch breaking changes early

Testing

Ran the tests locally with the new flag.

./tests/ci/run_accp_basic_tests.sh --latest-awslc

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

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  Misses          ?     1123           
  Partials        ?      487           

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