RFR: 8334201: Exclude CAInterop.java#certignarootca

[Christoph Langer]

The test is failing currently and the JBS issue could not be resolved since about a month, so let's exclude the test for now.

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Commit messages:
 - JDK-8334201

Changes: https://git.openjdk.org/jdk/pull/19689/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19689&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8334201
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/19689.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19689/head:pull/19689

PR: https://git.openjdk.org/jdk/pull/19689