RFR: 8349135: Add tests for HttpRequest.Builder.copy() [v5]

[Volkan Yazici]

On Tue, 4 Feb 2025 12:22:28 GMT, Volkan Yazici <vyazici at openjdk.org> wrote:

>> Adds `HttpRequest.Builder::copy` tests to `HttpRequestBuilderTest`.
>
> Volkan Yazici has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix `assertEquals()` argument order

Attached successful `tier{1,2}` test runs to the ticket.

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PR Comment: https://git.openjdk.org/jdk/pull/23415#issuecomment-2634033031