ci(actions): generate e2e tests matrix

[jijiechen]

Checklist prior to review

• Link to relevant issue as well as docs and UI issues --
  • N/A
• 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
  • Confirmed
• Tests (Unit test, E2E tests, manual test on universal and k8s)
  • Mannually tested
  • Don't forget ci/ labels to run additional/fewer tests
    • Added
• Do you need to update UPGRADE.md?
  • 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)
  • No need

This PR adds the ability to generate matrix for running E2E tests on GitHub Actions.

No E2E tests will be run at this time.

[jijiechen]

An example can be found here: https://github.com/jijiechen/kuma/actions/runs/6938484757
The ci/skip-* and ci/run-full-matrix labels are also supported.

[jijiechen]

I've just updated code with the first approach of merging matrix generating.
Please have a look at your convenience. @lahabana

[lahabana]

LGTM This looks great and good to go I think! Do you have an example run of this?

[jijiechen]

Yes, here are two:

• full matrix run: https://github.com/jijiechen/kuma/actions/runs/6958065668
• normal run: https://github.com/jijiechen/kuma/actions/runs/6958089045

In these examples, I took out dependencies from e2e to build, so the graphic could be slightly different than expected. The matrix generation was working the expected way.