[JENKINS-75849] Makes scriptConsole layout configurable (#10800)

Author: MarkEWaite

core/src/main/resources/jenkins/model/Jenkins/_script.jelly

@@ -27,7 +27,7 @@ THE SOFTWARE.
 -->
 <?jelly escape-by-default='true'?>
 <j:jelly xmlns:j="jelly:core" xmlns:st="jelly:stapler" xmlns:d="jelly:define" xmlns:l="/lib/layout" xmlns:t="/lib/hudson" xmlns:f="/lib/form">
-  <t:scriptConsole>
+  <t:scriptConsole layout="one-column">
     <pre>println(Jenkins.instance.pluginManager.plugins)</pre>
   </t:scriptConsole>
 </j:jelly>

core/src/main/resources/lib/hudson/scriptConsole.jelly

@@ -27,7 +27,19 @@ THE SOFTWARE.
 -->
 <?jelly escape-by-default='true'?>
 <j:jelly xmlns:j="jelly:core" xmlns:st="jelly:stapler" xmlns:d="jelly:define" xmlns:l="/lib/layout" xmlns:f="/lib/form">
-  <l:layout permission="${app.ADMINISTER}" title="${%scriptConsole}" type="one-column">
+  <st:documentation>
+    <st:attribute name="layout" use="optional">
+      Specify which layout to be use for the page.
+      See the type in layout for more details.
+      By default, it is `two-column`.
+    </st:attribute>
+  </st:documentation>
+
+  <j:set var="layout" value="${attrs.layout != null ? attrs.layout : 'two-column'}" />
+  <l:layout permission="${app.ADMINISTER}" title="${%scriptConsole}" type="${layout}">
+    <j:if test="${layout == 'two-column'}">
+      <st:include page="sidepanel.jelly" />
+    </j:if>
 
     <l:breadcrumb title="${%scriptConsole}"/>
     <l:main-panel>