fix: change config file loading error log to debug (#1565)

To reduce noise and a false-negative syslog upon a user's first boot.
this way, we can opt into the trace if there's an issue.

---
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used, see below:
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<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Style**
* Adjusted logging for configuration file loading errors to reduce log
verbosity.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/unraid-shared/src/util/config-file-handler.ts

@@ -59,7 +59,7 @@ export class ConfigFileHandler<T extends object> {
         ...fileConfig,
       });
     } catch (error) {
-      this.logger.warn(error, "Error loading config. Attempting to migrate...");
+      this.logger.debug(error, "Error loading config. Attempting to migrate...");
 
       try {
         const migratedConfig = await this.definition.migrateConfig();