Backport Kuma updates to 0.39

[rainest]

Backport fe761fa and 7816472 to 0.39 and release 0.39.2.

Update CI to test on PRs to release branches. Update license handling for this release branch.

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KIC 2.12 is able to pass E2E with this in place: Kong/kubernetes-ingress-controller#5760 (comment)

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This technically breaks semver, but we don't really have anywhere else to stuff it. Maybe you can call the addon not supporting version args and not supporting 2.6 "bugs" for the sake of discussion 🤷

Updating KIC 2.x to use the latest KTF causes all sorts of conflicts due to dependency hell with packages that both KTF and KIC import. We don't have a compelling need to actually update those in 2.x, so trying to make a backported KTF version that can run Kuma tests without pulling updates is much simpler.

@randmonkey can you confirm the exact nature of the Kuma failures? Was it just that it was trying to use latest without the 2.6 fix? IDK if we'd also need to pin the Kuma version in the 2.x KIC tests after this.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 47.36842% with 10 lines in your changes are missing coverage. Please review.

Project coverage is 59.84%. Comparing base (0389356) to head (481e0ba).

Files	Patch %	Lines
pkg/clusters/addons/kuma/addon.go	46.66%	6 Missing and 2 partials ⚠️
pkg/clusters/addons/kuma/builder.go	0.00%	1 Missing ⚠️
pkg/environments/builder.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@                Coverage Diff                 @@
##           release/0.39.x    #1017      +/-   ##
==================================================
- Coverage           59.88%   59.84%   -0.05%     
==================================================
  Files                  48       48              
  Lines                3914     3925      +11     
==================================================
+ Hits                 2344     2349       +5     
- Misses               1275     1279       +4     
- Partials              295      297       +2     

Flag	Coverage Δ
integration-test	59.84% <47.36%> (-0.05%)	⬇️

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[randmonkey]

According to @czeslavo discovered, After we add the allowAllTrafficPermission settings, the test could pass with kuma 2.6.x. But we still need to configure the version in the kuma addon, otherwise KTF cannot recognize the version thus it will not add the settings.