fix: avoid placeholder result for show node list

[Ariznawlll]

Summary

• normalize the empty placeholder ResultSet returned for show node list so mo-tester does not write the internal 1 column marker into generated results
• bind commands to actual results in run mode so the same normalization is used during comparison
• skip writing result text in genrs mode when a ResultSet is normalized to no result

Verification

• JAVA_HOME=$(/usr/libexec/java_home -v 20) PATH="$JAVA_HOME/bin:$PATH" mvn -q -DskipTests jar:jar
• locally verified a minimal show node list + result_scan(last_query_id()) case: before this fix mo-tester generated ➤ 1[-5,64,0]; after this fix it no longer emits the placeholder 1

Fixes matrixorigin/matrixone#17598

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