[test] Allow contract deployments to service account

Description

As requested from the community, it can be useful sometimes to be able to deploy contracts to the service account.

[x] Targeted PR against master branch
[x] Linked to Github issue with discussion and accepted design OR link to spec that describes this work
[x] Code follows the standards mentioned here
[x] Updated relevant documentation
[x] Re-reviewed Files changed in the Github PR explorer
[x] Added appropriate labels