[jdk21u] RFR: 8268916: Tests for AffirmTrust roots

[Rajan Halade]

Clean backport to JDK 21u

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Commit messages:
 - Backport 8c1bb2b28066ee32bef22110df06318d938c7d8b

Changes: https://git.openjdk.org/jdk21u/pull/255/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u&pr=255&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8268916
  Stats: 54 lines in 1 file changed: 54 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u/pull/255.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/255/head:pull/255

PR: https://git.openjdk.org/jdk21u/pull/255