[jdk21u-dev] RFR: 8333754: Add a Test against ECDSA and ECDH NIST Test vector

[Goetz Lindenmaier]

I backport this for parity with 21.0.6-oracle.

Applies clean, but test ECDSAPrimitive does not compile. The second commit contains the fixes for this.
In head, ECOperations.setSum takes a MutablePoint as second argument, 
so it is built from the available AffinePoint.
In 21, ECOperations.setSum() takes an AffinePoint, so I just pass the available one.

Tests pass.

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Commit messages:
 - Adapt test to Java 21
 - Backport fad6644eabbad6b6d3472206d9db946408aca612

Changes: https://git.openjdk.org/jdk21u-dev/pull/1108/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1108&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8333754
  Stats: 9497 lines in 4 files changed: 9497 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1108.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1108/head:pull/1108

PR: https://git.openjdk.org/jdk21u-dev/pull/1108