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Issue: Add support for silently ignoring renegotiation requests and mark renegotiation API as unstable

Issue: Add support for silently ignoring renegotiation requests and mark renegotiation API as unstable: a task in LegoFlow-SWE (Harbor dataset). Observed behavior When a server sends a TLS HelloRequest to initiate a renegotiation, the application callback registered via s2n config set renegotiate…

The task

**Observed behavior** When a server sends a TLS HelloRequest to initiate a renegotiation, the application callback registered via `s2n_config_set_renegotiate_request_cb` can only return `S2N_RENEGOTIATE_ACCEPT` or `S2N_RENEGOTIATE_REJECT`. Returning `S2N_RENEGOTIATE_REJECT` causes the library to send a warning alert…

Part of Lego-X/LegoFlow-SWE.