DEVOPS-375 MAINTENANCE Add boolean param. for outgoingNetworkCalls, a…

[vargmal]

*Add boolean param. for outgoingNetworkCalls.
Add stage for outgoing Network call test in Jenkinsfile.
Change docker file to catrobat-android stable

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Add boolean param. for outgoingNetworkCalls add. stage for outgoing Network call test in Jenkinsfile, add change docker file to catrobat-android stable

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[wslany]

Thanks!