chore(utils): Update utils/deprecation.ts from MigranTS output

This manually applies certain changes from BeksOmega's ts/migration2
branch, but notably:

- I did not apply the reordering of the doc comments at the top.
- I applied the deletion of types and @Package from the JSDoc.
- I preserved the import goog and goog.declareModuleId lines.
- I have applied a whitespace change on line 37 which violates the
  styleguide; I want to figure out why clang-format is not fixing
  this.

core/utils/deprecation.ts

@@ -22,22 +22,21 @@ goog.declareModuleId('Blockly.utils.deprecation');
 
 /**
  * Warn developers that a function or property is deprecated.
- * @param {string} name The name of the function or property.
- * @param {string} deprecationDate The date of deprecation.
+ * @param name The name of the function or property.
+ * @param deprecationDate The date of deprecation.
  *     Prefer 'month yyyy' or 'quarter yyyy' format.
- * @param {string} deletionDate The date of deletion, in the same format as the
+ * @param deletionDate The date of deletion, in the same format as the
  *     deprecation date.
- * @param {string=} opt_use The name of a function or property to use instead,
- *     if any.
+ * @param opt_use The name of a function or property to use instead, if any.
  * @alias Blockly.utils.deprecation.warn
- * @package
  */
-const warn = function(name: string, deprecationDate: string, deletionDate: string, opt_use?: string) {
+export function warn(
+  name: string, deprecationDate: string, deletionDate: string,
+  opt_use?: string) {
   let msg = name + ' was deprecated on ' + deprecationDate +
-      ' and will be deleted on ' + deletionDate + '.';
+    ' and will be deleted on ' + deletionDate + '.';
   if (opt_use) {
     msg += '\nUse ' + opt_use + ' instead.';
   }
   console.warn(msg);
-};
-export {warn};
+}