Fix DeriveTls13Keys with no_key

[embhorn]

Description

The fix adds a case no_key: to the switch statement in DeriveTls13Keys()

Fixes zd21243

Testing

Added tls13_derive_keys_no_key

Checklist

• added tests
• updated/added doxygen
• updated appropriate READMEs
• Updated manual and documentation

[Copilot]

Pull request overview

Adds support for calling DeriveTls13Keys() with no_key (previously treated as an invalid secret type), and introduces a regression test to validate the new behavior.

Changes:

• Handle no_key explicitly in DeriveTls13Keys() instead of returning BAD_FUNC_ARG.
• Expose DeriveTls13Keys() for test visibility and add a TLS 1.3 API test for the no_key path.
• Register the new test in the TLS 1.3 test suite header.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.

File	Description
wolfssl/internal.h	Changes DeriveTls13Keys() visibility to enable calling it from tests.
tests/api/test_tls13.h	Declares/registers the new tls13_derive_keys_no_key test.
tests/api/test_tls13.c	Adds a new test case exercising DeriveTls13Keys(..., no_key, ...).
src/tls13.c	Adds a case no_key: branch in DeriveTls13Keys() switch.

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[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

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[JacobBarthelmeh]

Force pushed to resolve minor merge conflict in tests/api/test_tls13.h

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

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