feat: add validation for zombienet flaky tests

[DenzelPenzel]

Description

Add some check in CI that would verify if test has a corresponding issue and if that issue exists. That verification could happen whenever some flaky test is added to the zombienet-flaky-tests.

[paritytech-workflow-stopper]

All GitHub workflows were cancelled due to failure one of the required jobs.
Failed workflow url: https://github.com/paritytech/polkadot-sdk/actions/runs/18556622090
Failed job name: test-linux-stable

[lrubasze]

How about using gh cli? Just to simplify the script a bit.
It is widely used in the CI.
eg.

polkadot-sdk/.github/workflows/check-semver.yml

Line 68 in ced629a

gh issue comment $PR --edit-last -F msg.txt || gh issue comment $PR -F msg.txt

Eg. we could get the issue state with this:

gh issue view 8944 --json state,title

[pepoviola]

gh issue view 8944 --json state,title

Yes, I think is a better approach. We can just query the state and ensure is OPEN

something like

if [[ $(gh issue view 1243 --json state  &>1 | jq -r .state) == "OPEN" ]];then echo pass; else echo err;fi

thanks @DenzelPenzel / @lrubasze 🙌