Revert "[BUGFIX] Set HTTP timeout to 20 seconds"

This reverts commit f49f871b.

The change for issue #102606 has the potential to do more harm
than good. The initial intention was to define a HTTP timeout to
be lower than the PHP `max_execution_time`. Defining general
HTTP `timeout` of 20 seconds now also limits e.g. long running
CLI processes - which can be considered a breaking change.

Resolves: #102610
Reverts: #102606
Releases: main, 12.4
Change-Id: I601051b8d52c9064800075cd0f928f236373e9ef
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/82140


Tested-by: Oliver Hader <oliver.hader@typo3.org>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>