ci: MSVC failures #29074

The Windows native CI is failing on unrelated changes, i.e in #29072. https://github.com/bitcoin/bitcoin/actions/runs/7194911390/job/19596459746?pr=29072:

rpc_help.py                                            | ✖ Failed  | 1 s
rpc_signer.py                                          | ✖ Failed  | 4 s
wallet_signer.py --descriptors                         | ✖ Failed  | 3 s

  node0 2023-12-13T12:48:04.392953Z [D:\a\bitcoin\bitcoin\src\rpc\request.cpp:187] [parse] [rpc] ThreadRPCServer method=help user=__cookie__ 
 test  2023-12-13T12:48:04.393000Z TestFramework (ERROR): Assertion failed 
                                   Traceback (most recent call last):
                                     File "D:\a\bitcoin\bitcoin\test\functional\test_framework\test_framework.py", line 131, in main
                                       self.run_test()
                                     File "D:\a\bitcoin\bitcoin/test/functional/rpc_help.py", line 55, in run_test
                                       self.test_categories()
                                     File "D:\a\bitcoin\bitcoin/test/functional/rpc_help.py", line 117, in test_categories
                                       assert_equal(titles, sorted(components))
                                     File "D:\a\bitcoin\bitcoin\test\functional\test_framework\util.py", line 57, in assert_equal
                                       raise AssertionError("not(%s)" % " == ".join(str(arg) for arg in (thing1, thing2) + args))
                                   AssertionError: not(['Blockchain', 'Control', 'Mining', 'Network', 'Rawtransactions', 'Util', 'Wallet', 'Zmq'] == ['Blockchain', 'Control', 'Mining', 'Network', 'Rawtransactions', 'Signer', 'Util', 'Wallet', 'Zmq'])
 test  2023-12-13T12:48:04.393000Z TestFramework (DEBUG): Closing down network thread 

This is happening on master too, and is related to disabling external signer on windows.

I guess the functional tests fail to see that there is no signer for some reason?