github-actions: add missing permissions

[v1v]

Summary

Fixes the required permissions for the GitHub actions in charge of managing the stale issues or PRs

There are some missing permissions and some error annotations in the GitHub workflow:

I discovered these errors as part of the CICD Observability for GitHub actions that we enabled some time ago and with some alerting when searching for Resource not accessible by integration

For further details please see actions/stale#840

QA

N/A, internal only

[tkajtoch]

This is interesting. Our actions seem to work just fine, but these errors are printed out. I'm happy to merge it to get rid of these error logs!

[cee-chen]

Reverted in #8076 - unfortunately stalebot went rogue as a result of these changes and auto-closed a bunch of issues we didn't want it to.

[v1v]

Reverted in #8076 - unfortunately stalebot went rogue as a result of these changes and auto-closed a bunch of issues we didn't want it to.

That's a shame... the current alerting we have in place for the CICD Observability will keep reporting these errors, in my view, it will be better if those errors are fixed to get the most out of the alerting - I'll add an exclusion if service is not eui

[cee-chen]

We can change permissions to read instead of write if needed which will omit the errors, but I don't see the point of that frankly - we don't need those specific jobs to even waste API calls reading issues, we just need them to look at PRs (or vice versa, depending on the job). Please do exclude EUI from your alerting!