[ refactor ] Split Core.TT #209

Job	Run time
initialise	4s
quick-check	11m 57s
ubuntu-bootstrap-racket	20m 47s
nix-bootstrap-chez	24m 46s
macos-bootstrap-chez	23m 5s
ubuntu-bootstrap-chez	11m 28s
ubuntu-self-host-previous-version	18m 39s
windows-bootstrap-chez	29m 6s
ubuntu-self-host-chez	12m 6s
ubuntu-build-api	7m 36s
ub-test-collie	42s
ub-pack-test-pack	16m 37s
ub-test-frex	4m 53s
ub-test-elab-util	1m 20s
ub-test-katla-and-html	9m 22s
ub-pack-test-lsp	19m 32s
ubuntu-self-host-racket	0s
macos-self-host-chez	33m 35s
windows-self-host-racket	14m 31s
	4h 20m 6s

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