[APIM 4.2.0] Fix file path issue

[DDH13]

Related to https://github.com/wso2-enterprise/wso2-apim-internal/issues/16356
This pull request improves cross-platform compatibility and file handling in the CLI by making file path operations platform-independent and addressing potential file locking issues on Windows. The changes focus on using the appropriate standard library functions for path operations and ensuring temporary files are properly closed before use.

Cross-platform file path handling:

• Replaced manual string splitting with filepath.Base in importAPIPolicy.go to reliably extract the file name from a path, making the code platform-independent.

Temporary file handling improvements:

• Updated CreateZipFileFromProject in fileIOUtils.go to close the temporary file before zipping to avoid file locking issues on Windows, and consistently use the temporary file path variable for cleanup and logging.

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