[tracing] removed the second y-axis and added export of chart data #1023

Job	Run time
check-opcodes	4s
riscv-isa-sim	40s
tc-gcc	2m 20s
tc-llvm	2h 34m 5s
verilator	23s
verilator-model (minpool)	30s
verilator-model (mempool)	47s
build-apps-omp (minpool)	46s
build-apps-omp (mempool)	53s
check-bootrom	23s
build-apps-gcc (minpool)	1m 9s
build-apps-gcc (mempool)	1m 7s
unit-test	0s
run-apps-gcc	0s
tc-halide	25s
build-apps-llvm (minpool)	1m 44s
build-apps-llvm (mempool)	1m 21s
build-apps-halide (minpool)	1m 10s
build-apps-halide (mempool)	1m 19s
run-apps-llvm	0s
run-apps-halide	0s
clean-up	2s
clean-up-compile-runs (minpool)	2s
clean-up-compile-runs (mempool)	2s
	2h 49m 12s

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