JENKINS-74931: Re-add the script field

The Active Choices plugin still depends on this field in order to be
able to use the script in a parameter. Re-add it for the moment since
the deprecated getter/setter added doesn't seem to be sufficient.

(cherry picked from commit 88a8919)

src/main/java/org/jenkinsci/plugins/scriptler/config/Script.java

@@ -25,6 +25,7 @@
 
 import edu.umd.cs.findbugs.annotations.CheckForNull;
 import edu.umd.cs.findbugs.annotations.NonNull;
+import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
 import hudson.Util;
 import java.io.Serial;
 import java.io.Serializable;
@@ -51,6 +52,12 @@ public class Script implements Comparable<Script>, NamedResource, Serializable {
      */
     private transient String scriptText;
 
+    /**
+     * @deprecated Use {@link #getScriptText()} and {@link #setScriptText(String)} instead.
+     */
+    @Deprecated(since = "384")
+    public transient String script;
+
     // User with Scriptler/RUN_SCRIPT permission can add/edit Scriptler step in projects
     public final boolean nonAdministerUsing;
 
@@ -206,8 +213,11 @@ public String getScript() {
         return getScriptText();
     }
 
+    @SuppressFBWarnings("PA_PUBLIC_PRIMITIVE_ATTRIBUTE")
+    @SuppressWarnings({"deprecated", "java:S1874"})
     public void setScriptText(String scriptText) {
         this.scriptText = scriptText;
+        script = scriptText;
     }
 
     /**