[EOSIO/eos] Run ctest with -j to parrallelize some tests (#5223)

validation_*** and unit_test_*** tests can be run in parallel and save at least 2 minutes of PR validation cycle time.
Create a label of nonparallizable_tests and change build kite to run with
ctest -j 8 -LE nonparallizable_tests -LE long_running_tests
ctest -L nonparallizable_tests

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