Update Peerplays CI to use new testing scheme

Specifically, update the .gitlab-ci.yml target peerplays_test:

• register_account for testvoter1, testvoter2, testvoter3, testvoter4, and testvoter5
• do not register_account for testalice
• update add_operation_to_builder_transaction for tests.pre
• update add_operation_to_builder_transaction for tests.during
  • with a preceding delay of 3 seconds to permit the contests to start
  • [Possibly necessary] Add signatures of the voter accounts (besides the signature of the fmv account)
• update add_operation_to_builder_transaction for tests.post
  • with a preceding delay of 61 seconds to permit the contests to finish
• Ensure that the built transactions are broadcast "sign_builder_transaction" '[0, true]'