POC - Refactor .NET 8 detection to eliminate FUNCTIONS_INPROC_NET8_ENABLED

[saadalia]

This suggestion could help us eliminate the need for FUNCTIONS_INPROC_NET8_ENABLED

Refactor the way .NET 8 projects are detected by removing the IsInProcDotNet8Enabled method and introducing DotnetHelpers.IsDotNet8 which checks the target framework in the .csproj file. Updated StartHostAction.cs methods to use the new detection logic and added necessary using directives and methods in DotnetHelpers.cs. Adjusted tests in StartHostActionTests.cs to align with the new logic.

Issue describing the changes in this PR

resolves #issue_for_this_pr

Pull request checklist

• My changes do not require documentation changes
  • Otherwise: Documentation issue linked to PR
• My changes do not need to be backported to a previous version
  • Otherwise: Backport tracked by issue/PR #issue_or_pr
• I have added all required tests (Unit tests, E2E tests)

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