fix(build): set envoy version conditionally (backport of #10538)

[lobkovilya]

Checklist prior to review

• Link to relevant issue as well as docs and UI issues --
• This will not break child repos: it doesn't hardcode values (.e.g "kumahq" as a image registry) and it will work on Windows, system specific functions like syscall.Mkfifo have equivalent implementation on the other OS --
• Tests (Unit test, E2E tests, manual test on universal and k8s) --
  • Don't forget ci/ labels to run additional/fewer tests
• Do you need to update UPGRADE.md? --
• Does it need to be backported according to the backporting policy? (this GH action will add "backport" label based on these file globs, if you want to prevent it from adding the "backport" label use no-backport-autolabel label) --

[jakubdyszkiewicz]

I don't understand this change. Can you add a description with "why do we need it" or link the issue?

[jakubdyszkiewicz]

ok, I see it's a backport. I can't see anything in the original PR as well :/
#10538

[lahabana]

Why are we getting a backport for 2.8 into master? That's not a backport it's a "frontport"... It's important as we're 10 people to now build systematic processes on these things...

[lahabana]

Also wasn't there a thing to auto merge branches?