feat(traefik): add latest 2.x and 3.x versions

[strowi]

hopefully fixes #507
Tested this on my local jsonnet repositories and it worked as expected. But please double-check ;)

[Duologic]

We might want to prune some older versions, in case someone is still using those they can pin to the version they have in jsonnetfile.lock.json

[strowi]

@Duologic sure, which ones? all legacy = true that would also cleanup the if-else? or more?

[Duologic]

I generally refer to the releases/support page of the operator, in this case: https://doc.traefik.io/traefik/deprecation/releases/

There deprecation policy looks quite rough tho. 🤔 Maybe keep 2.11 onwards, which was release in 2024?

[Duologic]

Perhaps the latest 2.10 patch as well, no need to keep all patch releases for a minor.

[strowi]

Just updated the PR removing all but the latest 2.10, 2.11 and 3.3 versions i could find via elm search repo traefik/traefik --versions.