Remove hipFileGetBackendVersion()

[derobins]

This will not be necessary as we consolidate hipFile and rocFile.

[Copilot]

Pull request overview

This PR removes the hipFileGetBackendVersion() API function as part of consolidating hipFile and rocFile. The function provided backend library version information in a platform-specific integer format.

Key Changes:

• Removed hipFileGetBackendVersion() function declaration from the public API header
• Removed function implementations from both AMD and NVIDIA backend code paths
• Removed all test coverage for the removed function

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
hipfile/include/hipfile.h	Removed API declaration and documentation for hipFileGetBackendVersion()
hipfile/src/nvidia_detail/hipfile.cpp	Removed NVIDIA backend implementation of hipFileGetBackendVersion()
hipfile/src/amd_detail/hipfile.cpp	Removed AMD backend implementation of hipFileGetBackendVersion()
hipfile/test/test-hipfile.cpp	Removed test code that called hipFileGetBackendVersion()
hipfile/test/system/version.cpp	Removed unit tests for hipFileGetBackendVersion()
hipfile/test/system/driver.cpp	Removed test invocation of hipFileGetBackendVersion()
hipfile/docs/core.rst	Updated documentation to remove backend version section and clarify version API usage
rocfile/docs/core.rst	Updated documentation to describe the new signature of rocFileGetVersion() with individual version components

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