Remove expectation of contacts from id-exporter (#8209)

It appears that, in the past, we wanted id-exporter's "tell me all the
accounts with unexpired certificates" functionality to limit itself to
account that have contact info. The reasons for this limitation are
unclear, and are quickly becoming obsolete as we remove contact info
from the registrations table.

Remove this layer of filtering, so that id-exporter will retrieve all
accounts with active certificates, and not care whether the contact
column exists or not.

Part of #8199

Author: aarongable

cmd/id-exporter/main.go

@@ -12,6 +12,7 @@ import (
 	"time"
 
 	"github.com/jmhodges/clock"
+
 	"github.com/letsencrypt/boulder/cmd"
 	"github.com/letsencrypt/boulder/db"
 	"github.com/letsencrypt/boulder/features"
@@ -77,8 +78,7 @@ func (c idExporter) findIDs(ctx context.Context) (idExporterResults, error) {
 		`SELECT DISTINCT r.id
 		FROM registrations AS r
 			INNER JOIN certificates AS c on c.registrationID = r.id
-		WHERE r.contact NOT IN ('[]', 'null')
-			AND c.expires >= :expireCutoff;`,
+		WHERE c.expires >= :expireCutoff;`,
 		map[string]interface{}{
 			"expireCutoff": c.clk.Now().Add(-c.grace),
 		})