RequiresManagedResourceID only has meaning for a ManagedAPIKey provider:
ManagedConnectorReady consults it exclusively on that path. A non-managed
provider that set it would advertise normally with the requirement
silently doing nothing. Reject the combination at registration, matching
the ManagedAPIKey/SupportsAPIKey mutual-exclusion guard already in
Register, and cover it with a TestRegistry_Register subtest.
Signed-off-by: Aurélien Sibiril <81782+aureliensibiril@users.noreply.github.com>
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