Added new kb article large-radgrid-export-system-operation-canceled-exception

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Pull Request Overview

Adds a new knowledge base article explaining how to resolve a System.OperationCanceledException during large RadGrid exports by adjusting the Document Processing Library (DPL) timeout.

• Introduces a markdown KB article with frontmatter metadata.
• Details environment, problem description, cause, and step-by-step solution.
• Provides configuration snippet and external references.

Comments suppressed due to low confidence (3)

knowledge-base/large-radgrid-export-system-operation-canceled-exception.md:45

• [nitpick] Clarify that this <appSettings> block should be merged into the existing <appSettings> section rather than creating a new one, to avoid duplicate sections in web.config.

<appSettings> 

knowledge-base/large-radgrid-export-system-operation-canceled-exception.md:51

• [nitpick] Add a note that modifying web.config will cause the application to restart, and recommend performing this change during a maintenance window if needed.

5. Save the file and test the export operation. 

knowledge-base/large-radgrid-export-system-operation-canceled-exception.md:55

• [nitpick] Consider adding a link to the Document Processing Library configuration docs for the Telerik.DplFormatProviderTimeout setting to give readers direct access to relevant DPL timeout guidance.

- [RadGrid Documentation](https://docs.telerik.com/devtools/aspnet-ajax/controls/grid/overview)