Improve the selection of plugin binaries

[crodas]

Description

Fixes #5402

If several plugin names are found in $PATH, prior to this commit the first binary to be found is being used.

This PR enhances the process by adding some heuristics. The algorithm works as follows:

1. Check if a binary exists in the same directory as the current forc binary.
2. Otherwise find all occurrences of the forc-plugin in the $PATH. Sort them by their version.
3. Use the newest (greater version) binary that is found. If no version can be parsed it is assumed to be the oldest available.

Checklist

• I have linked to any relevant issues.
• I have commented my code, particularly in hard-to-understand areas.
• I have updated the documentation where relevant (API docs, the reference, and the Sway book).
• I have added tests that prove my fix is effective or that my feature works.
• I have added (or requested a maintainer to add) the necessary Breaking* or New Feature labels where relevant.
• I have done my best to ensure that my PR adheres to the Fuel Labs Code Review Standards.
• I have requested a review from the relevant team or maintainers.

[crodas]

This will be fixed in #5395. Basically, #5395 will show a warning when multiple binaries are found in $PATH (fuelup should manage multiple versions)