RFR: 8249831: Test sun/security/mscapi/nonUniqueAliases/NonUniqueAliases.java is marked with @ignore [v2]

[Fernando Guallini]

> The test: **sun/security/mscapi/nonUniqueAliases/NonUniqueAliases.java** relies on the `certutil.exe` tool to import and delete certificates from a keystore. It was annotated with `@ignore` due to the uncertainty of `certutil.exe` being available on the instance where the test is executed.
> 
> Rather than ignoring the test entirely, this PR updates the logic to throw a `SkippedException` if the tool is not found, ensuring the test runs when possible, and gracefully skipped otherwise.

Fernando Guallini has updated the pull request incrementally with one additional commit since the last revision:

  Update copyright to 2025

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/21305/files
  - new: https://git.openjdk.org/jdk/pull/21305/files/db10f3cd..618b03ee

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21305&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21305&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/21305.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21305/head:pull/21305

PR: https://git.openjdk.org/jdk/pull/21305