RFR: 8353738: Update TLS unit tests to not use certificates with MD5 signatures [v2]

[Matthew Donovan]

> 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.

Matthew Donovan has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:

 - fixed indents and copyright year
 - Merge branch 'master' into update-md5-certs
 - 8353738: Update TLS unit tests to not use certificates with MD5 signatures

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/27342/files
  - new: https://git.openjdk.org/jdk/pull/27342/files/affe0fc9..a1933313

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27342&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27342&range=00-01

  Stats: 213159 lines in 2786 files changed: 164071 ins; 31722 del; 17366 mod
  Patch: https://git.openjdk.org/jdk/pull/27342.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27342/head:pull/27342

PR: https://git.openjdk.org/jdk/pull/27342