[TASK] Use namespaced ExtensionManagamentUtility

Made function createIsActiveConstraint namespaced as well due to consistancy

Resolves: #59682
Releases: 3.0
Change-Id: I90f0c9a73eafd840df083ea661cddf3ad4928a57
Reviewed-on: http://review.typo3.org/31756
Reviewed-by: Jochem de Groot <jochemdegroot@roquin.nl>
Tested-by: Jochem de Groot <jochemdegroot@roquin.nl>