8353738: Update TLS unit tests to not use certificates with MD5 signatures

[mpdonova]

This PR updates tests that were using MD5 certificates. For most of the tests, I added test cases for TLSv1.2/MD5withRSA and TLSv1.3/SHA256withRSA.

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Progress

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Issue

• JDK-8353738: Update TLS unit tests to not use certificates with MD5 signatures (Bug - P3)

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