Move Item Functions to Item Module

[JacobKnightley]

This pull request includes significant changes to the fabric_cicd module to improve error handling, file processing, and the publishing workflow for different item types. The most important changes include modifying error handling in the invoke method, adding a new ItemFile class for file processing, and updating the publishing methods for data pipelines, notebooks, and reports.

Error Handling Improvements:

• src/fabric_cicd/_common/_fabric_endpoint.py: Improved error message handling by checking the Content-Type header to determine if the response is JSON. [1] [2] [3]

New File Processing Class:

• src/fabric_cicd/_common/_item_file.py: Introduced the ItemFile class to handle file reading, encoding, and path manipulation.

Publishing Workflow Enhancements:

• src/fabric_cicd/_items/_datapipeline.py: Added _process_datapipeline_file_contents function to process data pipeline files during publishing. [1] [2]
• src/fabric_cicd/_items/_notebook.py: Added _process_notebook_file_contents function to replace default workspace IDs in notebook files during publishing.
• src/fabric_cicd/_items/_report.py: Added _process_report_file_contents function to handle semantic model dependencies in report files during publishing. [1] [2]

Codebase Simplification:

• src/fabric_cicd/fabric_workspace.py: Refactored _publish_item method to use the new ItemFile class and streamline the file processing workflow. [1] [2] [3] [4] [5]

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Files not reviewed (1)

• src/fabric_cicd/fabric_workspace.py: Evaluated as low risk