2491: Prevent URN map generation during indexing.

Updated functionality to skip URN map generation while the project is indexing. This helps avoid potential errors and enhances performance stability. A warning notifies users to wait until indexing finishes.

Author: VitaliyBoyko

CHANGELOG.md

@@ -10,6 +10,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0).
 
 - Compatibility with PhpStorm/IntelliJ 2025.* [#2495](https://github.com/magento/magento2-phpstorm-plugin/pull/2495)
 - "Copy Path/Reference" does not show the preview value [#2497](https://github.com/magento/magento2-phpstorm-plugin/pull/2497)
+- URN map generation during indexing [#2499](https://github.com/magento/magento2-phpstorm-plugin/pull/2499)
 
 ## 2025.0.0