Main Unity toolbar: "Unity Version Control" control isn't aligned to all other controls

This change requires good coordination with the Unity Version Control team, as the button itself cannot be fixed until the Editor toolbar supports it. For that reason, we will be splitting the work in two parts. UUM-36270 (this ticket) will set the basis in the Editor side, without introducing any breaking change. UUM-66555 will use the changes in UUM-36270 to fix the Unity Version Control button, ensuring backward compatibility.

This change requires good coordination with the Unity Version Control team, as the button itself cannot be fixed until the Editor toolbar supports it. For that reason, we will be splitting the work in two parts. UUM-36270 (this ticket) will set the basis in the Editor side, without introducing any breaking change. UUM-66555 will use the changes in UUM-36270 to fix the Unity Version Control button, ensuring backward compatibility.

This change requires good coordination with the Unity Version Control team, as the button itself cannot be fixed until the Editor toolbar supports it. For that reason, we will be splitting the work in two parts. UUM-36270 (this ticket) will set the basis in the Editor side, without introducing any breaking change. UUM-66555 will use the changes in UUM-36270 to fix the Unity Version Control button, ensuring backward compatibility.