POC - Refactor .NET 8 detection to eliminate FUNCTIONS_INPROC_NET8_ENABLED DLL approach

[saadalia]

Update target framework detection and add new method

Refactor the way .NET 8 projects are detected by removing the IsInProcDotNet8Enabled method and introducing DotnetHelpers.IsDotNet8.

The IsDotNet8 method uses the main DLL file to determine the target framework. Additionally, a new method GetScriptFilePath has been added to ExtensionsHelper.cs to retrieve the script file path, but it is currently incomplete and requires further implementation.

Issue describing the changes in this PR

resolves #issue_for_this_pr

Pull request checklist

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• I have added all required tests (Unit tests, E2E tests)

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