MDL-84016 reportbuilder: column methods for setting help icons.

This change exposes the underlying table library API for setting
help icon for table headers, via column instance getter/setter.

Support added for rendering said icons in system reports.

.upgradenotes/MDL-84016-2025012911500034.yml

@@ -0,0 +1,7 @@
+issueNumber: MDL-84016
+notes:
+  core_reportbuilder:
+    - message: >-
+        Columns added to system reports can render help icons in table headers
+        via `[set|get]_help_icon` column instance methods
+      type: improved

reportbuilder/classes/local/report/column.php

@@ -20,6 +20,7 @@ namespace core_reportbuilder\local\report;
 
 use core\exception\coding_exception;
 use core\lang_string;
+use core\output\help_icon;
 use core_reportbuilder\local\helpers\{aggregation, database, join_trait};
 use core_reportbuilder\local\aggregation\base;
 use core_reportbuilder\local\models\column as column_model;
@@ -89,6 +90,9 @@ final class column {
     /** @var array $attributes */
     private $attributes = [];
 
+    /** @var help_icon|null $helpicon */
+    private $helpicon = null;
+
     /** @var bool $available Used to know if column is available to the current user or not */
     private $available = true;
 
@@ -699,6 +703,26 @@ final class column {
         return $this->attributes;
     }
 
+    /**
+     * Set column help icon
+     *
+     * @param help_icon $helpicon
+     * @return self
+     */
+    public function set_help_icon(help_icon $helpicon): self {
+        $this->helpicon = $helpicon;
+        return $this;
+    }
+
+    /**
+     * Return column help icon
+     *
+     * @return help_icon|null
+     */
+    public function get_help_icon(): ?help_icon {
+        return $this->helpicon;
+    }
+
     /**
      * Return available state of the column for the current user. For instance the column may be added to a report with the
      * expectation that only some users are able to see it

reportbuilder/classes/table/system_report_table.php

@@ -109,7 +109,7 @@ class system_report_table extends base_report_table {
             $groupby = $fields;
         }
 
-        $columnheaders = $columnsattributes = [];
+        $columnheaders = $columnattributes = $columnicons = [];
 
         // Check whether report has checkbox toggle defined, note that select all is excluded during download.
         if (($checkbox = $this->report->get_checkbox_toggleall(true)) && !$this->is_downloading()) {
@@ -144,8 +144,9 @@ class system_report_table extends base_report_table {
                 $this->no_sorting($column->get_column_alias());
             }
 
-            // Generate column attributes to be included in each cell.
-            $columnsattributes[$column->get_column_alias()] = $column->get_attributes();
+            // Generate column attributes/icons for the table.
+            $columnattributes[$column->get_column_alias()] = $column->get_attributes();
+            $columnicons[] = $column->get_help_icon();
         }
 
         // If the report has any actions then append appropriate column, note that actions are excluded during download.
@@ -159,8 +160,9 @@ class system_report_table extends base_report_table {
         $this->define_columns(array_keys($columnheaders));
         $this->define_headers(array_values($columnheaders));
 
-        // Add column attributes to the table.
-        $this->set_columnsattributes($columnsattributes);
+        // Add column attributes/icons to the table.
+        $this->set_columnsattributes($columnattributes);
+        $this->define_help_for_headers($columnicons);
 
         // Initial table sort column.
         if ($sortcolumn = $this->report->get_initial_sort_column()) {