ci: avoid depending on stack job for test-bootstrap jobs

This patch makes test-bootstrap related ci jobs only depend on
hadrian-ghc-in-ghci job to finish, consistent with other jobs in the
full-build stage generated by gen_ci.hs. This allows the jobs to be
spawned earlier and improve overall pipeline parallelism.

(cherry picked from commit e684c406)
(cherry picked from commit 4884eb08)
(cherry picked from commit f3a9d4ec)
(cherry picked from commit 90253985)