RFR: 8378164: test/jdk/java/net/httpclient/http3/*.java: convert tests that use ITestContext to JUnit [v3]

[Volkan Yazici]

On Fri, 20 Feb 2026 20:32:05 GMT, Daniel Fuchs <dfuchs at openjdk.org> wrote:

>> Similar to https://github.com/openjdk/jdk/pull/29786 - this time with HTTP/3 tests.
>
> Daniel Fuchs has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - Update test/jdk/java/net/httpclient/http3/PostHTTP3Test.java
>    
>    Co-authored-by: Andrey Turbanov <turbanoff at gmail.com>
>  - Update test/jdk/java/net/httpclient/http3/GetHTTP3Test.java
>    
>    Co-authored-by: Andrey Turbanov <turbanoff at gmail.com>

Marked as reviewed by vyazici (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/29824#pullrequestreview-3843384053