feat: Use `SocketsHttpHandler` to configure `HttpClient` in .NET 6+ #5268

Job	Run time
Check if source files were modified, skip remaining jobs if not / Check if source files were modified, skip remaining jobs if not	9s
Validate shell scripts	1s
Build FullAgent and MSIInstaller	1s
Run Linux Container Tests	1s
Build IntegrationTests	1s
Build UnboundedIntegrationTests	1s
Create Debian package	1s
Create RPM Package	1s
Run IntegrationTests	1s
Run Unbounded Tests	1s
Run ArtifactBuilder	1s
Check Test Matrix Status	6s
	25s

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