Use rbenv
executable directly if available
#2824
Merged
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Motivation
Closes #2822
I believe the issue the users are facing is similar to #2791, where sourcing shell scripts may fail, then Homebrew paths are never properly set up and we can't find the executable.
Let's check for known paths first and prefer those over just the executable name, since this seemed to improve the situation for Shadowenv.
Implementation
I extracted a more generic implementation to the parent class and started using it for both Shadowenv and rbenv. If the executables exist in known paths, we use those directly without counting that they will be available in the PATH.