[Ruby] - 3.1 EOL and 3.4 addition

[Kaniska244]

Ref: Issue

Description: Ruby 3.1 EOL on March 31st 2025 & Adding Ruby 3.4 available since Dec 2024 to the ruby devcontainer feature.

Changelog:

• Change in devcontainer-feature.json to remove ruby 3.1 & add ruby 3.4
• Change in Scenarios.json to correct the Ruby test criteria based on latest versions.
• Change in install_additonal_ruby.sh & ruby_fallback_test.sh test scripts correct the expected ruby versions.

Checklist:

• All changes work as expected.

[ddoyle2017]

Changes look good! However it might probably be better to split these into separate PRs next time:

• one for the removal of 3.1
• one for adding 3.4

[Kaniska244]

Changes look good! However it might probably be better to split these into separate PRs next time:

• one for the removal of 3.1
• one for adding 3.4

Hi @ddoyle2017 ,

That did cross my mind while doing this PR. I decided otherwise because of the fact that for ruby feature both the higher & lower versions were outdated already which prompted me to update both, while doing so thought that it could be better I do it at once in the same PR so that in case of any issue with both the versions changing, it would be easy to isolate the problem.
Next time onwards I will come up separate PR's for things like this. Kindly let me know if its fine to go ahead with this PR for the time being or should I come up with separate PRs.

With Regards,
Kaniska