Fix: Downgrade FileUploadExecutorManager missing log to debug #4535

[UmairStn]

This PR addresses the startup error log related to FileUploadExecutorManager.

Changes:
Wrapped the FileUploadExecutorManager null check in a log.isDebugEnabled() block.
Downgraded the log level from error to debug to reduce log noise during early startup phases.
Verified the build using mvn clean install for the org.wso2.carbon.ui module.

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[wso2-engineering]

AI Agent Log Improvement Checklist

⚠️ Warning: AI-Generated Review Comments

• The log-related comments and suggestions in this review were generated by an AI tool to assist with identifying potential improvements. Purpose of reviewing the code for log improvements is to improve the troubleshooting capabilities of our products.
• Please make sure to manually review and validate all suggestions before applying any changes. Not every code suggestion would make sense or add value to our purpose. Therefore, you have the freedom to decide which of the suggestions are helpful.

✅ Before merging this pull request:

• Review all AI-generated comments for accuracy and relevance.
• Complete and verify the table below. We need your feedback to measure the accuracy of these suggestions and the value they add. If you are rejecting a certain code suggestion, please mention the reason briefly in the suggestion for us to capture it.

Comment	Accepted (Y/N)	Reason
#### Log Improvement Suggestion No: 1
#### Log Improvement Suggestion No: 2

[CLAassistant]

All committers have signed the CLA.

[UmairStn]

AI Agent Log Improvement Checklist

⚠️ Warning: AI-Generated Review Comments

• The log-related comments and suggestions in this review were generated by an AI tool to assist with identifying potential improvements. Purpose of reviewing the code for log improvements is to improve the troubleshooting capabilities of our products.
• Please make sure to manually review and validate all suggestions before applying any changes. Not every code suggestion would make sense or add value to our purpose. Therefore, you have the freedom to decide which of the suggestions are helpful.

✅ Before merging this pull request:

• Review all AI-generated comments for accuracy and relevance.
• Complete and verify the table below. We need your feedback to measure the accuracy of these suggestions and the value they add. If you are rejecting a certain code suggestion, please mention the reason briefly in the suggestion for us to capture it.

Comment Accepted (Y/N) Reason
#### Log Improvement Suggestion No: 1 | Y | Added a warning for when the service is unavailable. |
#### Log Improvement Suggestion No: 2 | Y | Added debug logging for better traceability of configurations. |

[UmairStn]

I have applied the suggested log improvements and signed the CLA. Ready for final review! @wso2-engineering