feature(boot): strip let%expect_test #38085

Job	Run time
Format	1m 33s
Bootstrap (ubuntu-latest)	4m 43s
Documentation	56s
Cygwin Build	3m 11s
Nix Build 4.08 (ubuntu-latest)	1m 29s
Build with OxCaml (ubuntu-latest)	25m 43s
Test that the utop dev tool can be built and run	9m 0s
Nix Tests (ubuntu-latest)	8m 26s
Nix Build (macos-latest)	2m 34s
Nix Build (ubuntu-latest)	1m 16s
Rocq 9.1	7m 21s
Rocq 9.1 (native)	12m 29s
Wasm_of_ocaml	6m 45s
Create local opam switch (macos-latest, 5)	9m 24s
Build microbenchmarks	2m 4s
Create local opam switch (ubuntu-latest, 5)	6m 17s
Building Dune with OxCaml	23m 55s
Build	0s
	2h 7m 6s

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