RFR: 8358171: Additional code coverage for PEM API [v5]

[Anthony Scarpino]

On Thu, 5 Jun 2025 10:20:40 GMT, Fernando Guallini <fguallini at openjdk.org> wrote:

>> The tests included in this PR add code coverage mainly to the following classes introduced/updated by JEP 470 (PEM): PEMDecoder, PEMEncoder, Pem, EncryptedPrivateKeyInfo and the Key factories. In addition, more tests are included for RSAPSS, multithreading, _jdk.epkcs8.defaultAlgorithm_ property and some negative testing
>
> Fernando Guallini has updated the pull request incrementally with one additional commit since the last revision:
> 
>   styling fixes

I'm fine with the change

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Marked as reviewed by ascarpino (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/25588#pullrequestreview-2900862169