[jdk21u] RFR: 8314960: Add Certigna Root CA - 2

[Rajan Halade]

The clean backport to JDK 21u to add new root CA.

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Commit messages:
 - Backport e9ba8d5a0e74c7e61f963b9a295662899d0156dd

Changes: https://git.openjdk.org/jdk21u/pull/107/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u&pr=107&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8314960
  Stats: 568 lines in 4 files changed: 338 ins; 227 del; 3 mod
  Patch: https://git.openjdk.org/jdk21u/pull/107.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/107/head:pull/107

PR: https://git.openjdk.org/jdk21u/pull/107