MDL-81521 core: Update all possibly data providers to be static

Note: Some data providers could not be automatically be converted to
being static. These will be handled in a separate issue.

notes/tests/reportbuilder/datasource/notes_test.php

@@ -137,7 +137,7 @@ class notes_test extends core_reportbuilder_testcase {
      *
      * @return array[]
      */
-    public function datasource_filters_provider(): array {
+    public static function datasource_filters_provider(): array {
         return [
             'Filter content' => ['content', 'Cool', 'note:content', [
                 'note:content_operator' => text::IS_EQUAL_TO,