[TASK] Remove system environment check for Soap

TYPO3 no longer requires the Soap extension and
should not check for it in system environment checks.

This patch removes the check.

Change-Id: I3dc5715889af598054e2451c957a05c13f39b9fa
Resolves: #82452
Releases: master, 8.7
Reviewed-on: https://review.typo3.org/54117


Reviewed-by: Stephan Großberndt <stephan@grossberndt.de>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Alexander Schnitzler <review.typo3.org@alexanderschnitzler.de>
Tested-by: Alexander Schnitzler <review.typo3.org@alexanderschnitzler.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>