RFR: 8358688: HttpClient: Simplify file streaming in RequestPublishers.FilePublisher [v4]

[Daniel Fuchs]

On Wed, 11 Jun 2025 10:49:48 GMT, Volkan Yazici <vyazici at openjdk.org> wrote:

>> Simplifies content streaming for `HttpRequest.BodyPublishers::ofFile(Path)`, which delegates to `RequestPublishers.FilePublisher::create(Path)`. This effectively replaces all usages of `FileInputStream::new` in `HttpClient` with `Files::newInputStream(Path)`. See the JBS ticket description for the full story.
>> 
>> Also removing certain test files which were rendered redundant after `SecurityManager` removal. We do this in this PR, since tests were added due to touched lines.
>> 
>> `tier1,2` results on b5f3c8dc6f4 are attached to the ticket.
>
> Volkan Yazici has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains six additional commits since the last revision:
> 
>  - Merge remote-tracking branch 'upstream/master' into requestPublishersDefaultFs
>  - Improve comments
>  - Update tests
>  - Add back removed SM tests
>  - Remove redundant tests
>  - Remove redundant OIO usage in `RequestPublishers`

Marked as reviewed by dfuchs (Reviewer).

-------------

PR Review: https://git.openjdk.org/jdk/pull/25662#pullrequestreview-2916825131