RFR: 8350279: HttpClient: Add a new HttpResponse method to identify connections [v6]

[Daniel Fuchs]

On Fri, 4 Apr 2025 12:47:19 GMT, Volkan Yazici <vyazici at openjdk.org> wrote:

>> Adds `HttpResponse::connectionLabel` method that provides an identifier for the connection.
>> 
>> **Implementation note:** The feature is facilitated by `HttpConnection::label`, which should not be confused with `HttpConnection::id`. This distinction is explained in the JavaDoc of both properties.
>
> Volkan Yazici has updated the pull request incrementally with five additional commits since the last revision:
> 
>  - Remove timeout from `CountDownLatch::await` calls
>  - Replace `@AutoClose` with a corresponding `@AfterEach` method
>  - Remove IDE-specific `OptionalGetWithoutIsPresent` warning suppression
>  - Improve `HttpConnection::label` JavaDoc
>  - Start from 1 while labeling connections

New changes look good to me.

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Marked as reviewed by dfuchs (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/24154#pullrequestreview-2742914834