This prevents adding `Content-Length` and `Transfer-Encoding` headers
when sending a request with an empty body using CurlHttpClient

…(nicolas-grekas)

This PR was merged into the 6.4 branch.

Discussion
----------

[HttpClient] Fix buffering AsyncResponse with no passthru

| Q             | A
| ------------- | ---
| Branch?       | 6.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Issues        | Fix #59574
| License       | MIT

Commits
-------

19a50f7e5fb [HttpClient] Fix buffering AsyncResponse with no passthru

* 6.4:
  [Process] Fix process status tracking
  [HttpClient] Fix buffering AsyncResponse with no passthru
  [HttpClient] Fix uploading files > 2GB
  [Mime] use isRendered method to avoid rendering an email twice

* 6.4:
  pass CURLOPT_INFILESIZE_LARGE only when supported

* 6.4:
  [WebProfilerBundle] Fix tests
  [Cache] Tests for Redis Replication with cache
  [BrowserKit] Fix submitting forms with empty file fields
  [WebProfilerBundle] Fix interception for non conventional redirects
  [DependencyInjection] Do not preload functions
  [DependencyInjection] Fix cloned lazy services not sharing their dependencies when dumped with PhpDumper
  [HttpClient] Fix activity tracking leading to negative timeout errors
  [Security] Return null instead of empty username to fix deprecation notice
  [DependencyInjection] Fix env default processor with scalar node

* 6.4:
  Fixes XliffFileDumperTest for 6.4
  [HttpClient] Don't send any default content-type when the body is empty
  [VarExporter] Fix lazy objects with hooked properties
  [Translation] check empty notes
  ntfy-notifier: tfix in description