[BUGFIX] Revert "[BUGFIX] Add support for symfony/event-dispatcher-contracts v1"

This reverts commit e2b1148c.

Our Event dispatcher adapter is currently not compatible with
symfony/event-dispatcher-contracts:v1 (type declaration mismatch)
and therefore results in a runtime fatal error with symfony v4.

Compatibility with symfony v4 will be added in a new
revision of the reverted patch.

Releases: master, 10.4
Reverts: #92229
Resolves: #92239
Change-Id: Ifc920b839cb1cdaaf90f3afcfa0c961b59c0f343
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/65648


Tested-by: Benni Mack <benni@typo3.org>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Benjamin Franzke <bfr@qbus.de>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Benjamin Franzke <bfr@qbus.de>