fix(kuma-cp): fix Zone{In|E}gress sync when no mesh

[bartsmykla]

• Add ZoneEgresses to AggregatetMeshContexts when there is no mesh.
• Sync ZoneIngresses and ZoneEgresses only when the hash changes.
• Return an error with the correct resource type (ZoneEgress) when a ZoneEgress cannot be found.

Checklist prior to review

• Link to relevant issue as well as docs and UI issues
  • No relevant issue
• 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
  • It won't
• Tests (Unit test, E2E tests, manual test on universal and k8s)
  • Don't forget ci/ labels to run additional/fewer tests
  • Manually tested on k3d
• Do you need to update UPGRADE.md?
  • There is no need
• 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)
  • It does

[bartsmykla]

Closing in favour of #8129 as I need to publish it and it's not possible for forks (secrets are not shared with PRs from forks)