Add a `x perf` command for integrating bootstrap with `rustc-perf` #127797

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Job	Run time
Calculate job matrix	12s
PR - mingw-check	26m 9s
PR - mingw-check-tidy	4m 42s
PR - x86_64-gnu-llvm-17	53m 32s
PR - x86_64-gnu-tools	50m 24s
bors build finished	0s
	2h 14m 59s