test: add job to run e2e and integration tests daily for validating kong images

[randmonkey]

What this PR does / why we need it:

Adds a daily workflow to run e2e tests and integration tests on KIC 2.12 LTS against Kong 2.8 LTS and Kong 3.4 LTS to verify compatibility.

Which issue this PR fixes:

fixes #5286

Special notes for your reviewer:

• We need to enable this after KIC 2.12.3 releases Release v2.12.3 #5257 to include the fixes.
• Do we need to run against on kubernetes versions and GKE clusters?

PR Readiness Checklist:

Complete these before marking the PR as ready to review:

• the CHANGELOG.md release notes have been updated to reflect any significant (and particularly user-facing) changes introduced by this PR

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.5%. Comparing base (d4d18a4) to head (f28b9ef).
Report is 61 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #5317     +/-   ##
=======================================
- Coverage   76.9%   73.5%   -3.4%     
=======================================
  Files        214     213      -1     
  Lines      25169   25004    -165     
=======================================
- Hits       19356   18391    -965     
- Misses      4794    5598    +804     
+ Partials    1019    1015      -4     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[pmalek]

Do we need to run against on kubernetes versions and GKE clusters?

I believe at least for starters we can "just" run this as usual on kind. We can add e.g. running on GKE when the pipeline proves to be stable.

---

@randmonkey Is this still blocked on something?

[randmonkey]

Do we need to run against on kubernetes versions and GKE clusters?

I believe at least for starters we can "just" run this as usual on kind. We can add e.g. running on GKE when the pipeline proves to be stable.

@randmonkey Is this still blocked on something?

No blockers I think.