Helper for callers that need to know whether a given connector row is
still referenced by any access_sources. Used by the SCIM disconnect
flow, which would otherwise fail with a foreign-key violation when the
connector is shared with an access source.
Mirrors the shape of CountByOrganizationID.
Signed-off-by: Aurélien Sibiril <81782+aureliensibiril@users.noreply.github.com>
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