RA: inform publisher of CT submission type (#7164)

Have the RA populate the new pubpb.Request.Kind field, along side the
deprecated pubpb.Request.Precert field, so that the publisher has more
detailed information about what kind of CT submission this is.

Fixes #7161

ctpolicy/ctpolicy.go

@@ -139,6 +139,7 @@ func (ctp *CTPolicy) GetSCTs(ctx context.Context, cert core.CertDER, expiration
 			LogPublicKey: key,
 			Der:          cert,
 			Precert:      true,
+			Kind:         pubpb.SubmissionType_sct,
 		})
 		if err != nil {
 			return nil, url, fmt.Errorf("ct submission to %q (%q) failed: %w", g, url, err)
@@ -200,8 +201,10 @@ func (ctp *CTPolicy) GetSCTs(ctx context.Context, cert core.CertDER, expiration
 // It neither waits for these submission to complete, nor tracks their success.
 func (ctp *CTPolicy) submitAllBestEffort(blob core.CertDER, isPrecert bool, expiry time.Time) {
 	logs := ctp.finalLogs
+	kind := pubpb.SubmissionType_final
 	if isPrecert {
 		logs = ctp.infoLogs
+		kind = pubpb.SubmissionType_info
 	}
 
 	for _, group := range logs {
@@ -218,6 +221,7 @@ func (ctp *CTPolicy) submitAllBestEffort(blob core.CertDER, isPrecert bool, expi
 						LogPublicKey: log.Key,
 						Der:          blob,
 						Precert:      isPrecert,
+						Kind:         kind,
 					},
 				)
 				if err != nil {