ssl: Store ClientCert in Stateless SessionTicket

[sindrip]

During session resumption with stateless tickets a previously verified client certificate will not be available in the resumed session. Storing the certificate in the session ticket allows us to retrieve it during session resumption handshake.

This PR is related to #5870 but only covers the case of storing the client certificate.

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[github-actions[bot]]

CT Test Results

Tests are running... https://github.com/erlang/otp/actions/runs/2264360086

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// Erlang/OTP Github Action Bot

[sindrip]

tls_server_session_ticket_SUITE seems to be skipped, this is now dependent on #5951 (along with work on the tests)

[u3s]

please resolve conflicts and push an update to enable test execution on our side

[sindrip]

Hi @u3s, I have resolved the conflicts

[IngelaAndin]

We will get to this we just want to resolve the other PR regarding stateless tickets first.

[sindrip]

Perfectly reasonable, I appreciate the update

[sindrip]

Hi @IngelaAndin and @u3s, have you had any time to look at this?

I just quickly rebased to clear up the conflict

[u3s]

we will have a discussion and let you know. should happen this or next week.

[sindrip]

Thanks for the review, I will try and find the time to implement the requested changes as soon as possible.

[sindrip]

This PR can be closed in favor of #6362