Fix BSP target capabilities

[AnthonyGrod]

Context: I'm working on integrating Mill over the new BSP plugin (I created a pull request with more detail a few weeks ago here: #3432)

I encountered an issue where there were to many options of actions that could be performed on a certain testing module. Namely, there was a redundant run capability. On the first screenshot there is the option menu before my changes and on the second after them.

The visual aspect of this fix is nice but not the most important one. Without this fix, the testing via BSP does not work at all - the BSP plugin, even after triggering the Test button, launches Run action instead of the Test action if the module's canRun capability is set to true.

[lefou]

Since TestModules are also RunModules, it's legit to run a main class without any test framework. Therefore I doubt simply disabling the run capability is the correct solution: Looks like a workaround fro some other underlying issue to me.