chore(nix): remove ocamllsp flake #29891

Job	Run time
Nix (macos-latest)	2m 0s
Documentation	52s
Build (macos-latest, 5.1.x)	55s
Nix (ubuntu-latest)	54s
Format	1m 1s
Build (ubuntu-latest, 5.1.x)	8m 56s
Build (ocaml-variants.5.4.0+trunk, ubuntu-latest, true)	1m 27s
Build microbenchmarks	2m 27s
Build (4.14.x, ubuntu-latest, true)	1m 24s
Create local opam switch (macos-latest, 5)	59s
Build (4.14.x, macos-latest, true)	46s
Build monorepo benchmark docker image	1m 43s
Create local opam switch (macos-latest, 4.14)	43s
Wasm_of_ocaml	11m 29s
Build (5.1.x, macos-13, true)	4m 56s
Create local opam switch (ubuntu-latest, 5)	58s
Build (ocaml-base-compiler.4.14.2,system-msvc, windows-latest)	14m 57s
Create local opam switch (ubuntu-latest, 4.14)	45s
Build (ocaml-base-compiler.5.1.1,system-mingw, windows-latest)	8m 38s
Build (4.08.x, ubuntu-latest, true)	2m 9s
Coq 8.16.1	7m 5s
Build (4.04.x, ubuntu-latest, true, true)	4m 26s
Build (4.02.x, ubuntu-latest, true)	1m 43s
	1h 21m 13s

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