Add cocotb testbench runner #1310

Job	Run time
cocotb_test / cocotb_test	2m 18s
make_boot / make_boot (zynq, PandABox-no-fmc)	3m 40s
make_boot / make_boot (zynqmp, xu5_st1-no-fmc)	3m 45s
make_zpkg / make_zpkg (PandABox-no-fmc)	3m 40s
make_boot / make_boot (zynqmp, PandABrick)	3m 44s
make_zpkg / make_zpkg (PandABox-fmc_24vio)	3m 43s
make_zpkg / make_zpkg (PandABox-fmc_acq427)	3m 42s
test_matrix / test_matrix	2m 3s
make_zpkg / make_zpkg (PandABox-fmc_acq430)	3m 41s
make_zpkg / make_zpkg (PandABox-fmc_lback-sfp_lback)	3m 44s
test_python_autogen / test_python_autogen	3m 3s
make_zpkg / make_zpkg (PandABrick)	3m 42s
make_zpkg / make_zpkg (xu5_st1-no-fmc)	3m 40s
make_zpkg / make_zpkg (xu5_st1-fmc_acq430)	3m 41s
test_hdl / test (pcap pgen)	27s
test_hdl / test (seq posenc clock)	1s
test_hdl / test (pcomp lut div bits)	26s
test_hdl / test (counter filter calc)	28s
test_hdl / test (pulse srgate qdec)	9s
release	1s
	49m 38s

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