Make a test name matching nothing an error, and drop the dead CI jobs

[oliviermattelaer]

tests/test_manager.py reported OK when a requested name selected zero tests, so a CI job kept being green long after its test had been renamed or deleted.

test_manager.py

TestFinder now remembers what was explicitly asked for (restrict_to) and can tell which of those expressions selected none of the collected tests (unmatched_expressions, using collected_possibility to recognise a selection made by function, class, module or directory name). run() reports them and the script exits 1.

• A plain name selecting nothing is an error.
• A regular expression is only a warning, since it is allowed to select nothing.
• The bulk modes (no name given, -p U / -p A) are untouched.
• When the name still exists elsewhere under tests/, the error says where, since that is usually a wrong -p option.

Dead CI jobs removed

job	test	gone since
acceptancetest_28	test_read_madgraph4_proc_card	deleted in 9772921
acceptancetest_36	test_v4_heft	disabled (notest_) in 360366a, v4 not supported anymore
acceptancetest_48	test_eft_running_nlo	disabled (notest_) in 6dc8390 -- the surviving LO test_eft_running is already run by acceptancetest_madevent.yml
acceptancetest_65 / acceptancetest_66	test_tt_semi / test_zh	deleted with madweight in 9d3c959, which did remove those two jobs; a later merge brought them back
IOtest_cpp_write	testIO_write_cpp_go_process_cc_file, testIO_write_dec_multiprocess_files	deleted with the pythia8 export tests in c83282d, which cleaned unittest.yml but not IOtest.yml

aloha.yml

testIO_aloha.*-e was a missing space, so no testIO_aloha test was ever selected (none exists) and the -e exclusion was inert, running test_short_mssm_subset_creation in the very batch it is meant to be kept out of.

Validation

Rebased from claude/fix-dead-ci-test-names (one conflict, in IOtest.yml, where main added the IOtest_fd_gauge job next to the removed IOtest_cpp_write one -- both kept/removed as intended). The change content is otherwise identical to the original commit.

On this branch:

• All seven removed test names still have zero definitions under tests/.
• Every test_manager.py invocation in .github/workflows/*.yml was replayed against the new unmatched_expressions check (including the madspin_parallel.yml matrix expansion): no surviving job trips the new error. The only skipped invocation is the regex in check_xsec_processes_mg7.yml, which is warn-only by design.
• ./tests/test_manager.py test_test_finder -t0 -> 6 tests, OK, exit 0.
• ./tests/test_manager.py test_read_madgraph4_proc_card -pA -t0 -> error reported, exit 1.

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