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

[duke]

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

@vy 
Your change (at version 9f7b054b0e96244aea374dbf2555f2a03f61cab0) is now ready to be sponsored by a Committer.

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PR Comment: https://git.openjdk.org/jdk/pull/23415#issuecomment-2634035897