Fix Snowflake resync failure due to case mismatch in _resync table suffix (#4184)

The resync suffix was appended in lowercase ("_resync"), producing
mixed-case identifiers like "ACCOUNTS_resync". However, getColsFromTable()
in qrep.go unconditionally applied strings.ToUpper(), converting it to
"ACCOUNTS_RESYNC". Since Snowflake treats quoted identifiers as
case-sensitive, the table lookup failed with "does not exist".

Fix in Snowflake's getColsFromTable: replace the unconditional
strings.ToUpper with snowflakeSchemaTableNormalize so quoted mixed-case
identifiers are looked up consistently with how they are created. The
shared cdc_flow.go is left untouched since the suffix handling is a
Snowflake-specific concern.

Author: kang8

flow/connectors/snowflake/qrep.go

@@ -184,7 +184,7 @@ func (c *SnowflakeConnector) getColsFromTable(ctx context.Context, tableName str
 		return nil, fmt.Errorf("failed to parse table name: %w", err)
 	}
 
-	fq := fmt.Sprintf("%s.%s", strings.ToUpper(schemaTable.Namespace), strings.ToUpper(schemaTable.Table))
+	fq := snowflakeSchemaTableNormalize(schemaTable)
 
 	channel := make(chan string, 1)
 	ctxWithOpt := gosnowflake.WithQueryIDChan(ctx, channel)