ci_select: fix the membrowse test's env dependence, and stop HIL unit tests taking the rig (#3846)

test_the_upload_board_can_diverge_from_the_built_board called
get_family_boards without ci=True, so it pinned the developer's set, not the
runner's: the CI skip lists move the one-first pick on three families. It
held locally and went red on its first CI run. Pass ci=True, as
_prune_buildable already does, and pin the runner's twelve.

Rule 2 is a bare test/hil/ prefix, so the harness's own unit tests booked the
full 27-board rig for diffs that cannot reach it. Carve test/hil/test/** out
to rule 1b, beside test/{fuzz,unit-test}/**; the harness itself is untouched.
A test pins that directory's file list, so anything added there that the rig
does read fails rather than silently skipping hardware. Rule table updated in
the spec and its carbon in the docstring.

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