Allow to run a power flow on only the synchronous component

[alicecaron]

Describe the current behavior

A power flow can be launched only on all the components or on only the main connected component.

Describe the expected behavior

It is now possible to run a power flow on the main synchronous component only.

Describe the motivation

No response

Extra Information

Use the new parameter option added in core#3577 : ConnectedComponentMode::MAIN_SYNCHRONOUS to run power flow only on the main synchronous component