[tracker] Remove ignition-tools cmake check in Ignition software

[j-rivero]

Currently the ignition-tools code generates a CMake/pkg-config module installed in the system with minimal information (package is pure ruby), the rest of the Ignition family is detecting at building time if ignition-tools is present on the system and installing the corresponding submodule for ign tool. This can be suboptimal:

• build time to decide if an user wants or not the ign submodule is not the best moment.
• ign modules are cheap in every sense (small ruby files)

Let's remove the check and install ign submodules files unconditionally:

• fuel 1
• fuel 5 : forward --> 6, main
• gui 3 : forward --> 4, 5, main
• msgs 1
• msgs 5 : forward --> 6, 7, main
• sdformat 6
• sdformat 9
• sdformat 12, main
• transport 4
• transport 8 : forward --> 9, 10, main
• gazebo / sim 3
• launch 2