add load balancer attributes support for IngressClassParams

[oliviassss]

Description

This PR adds an optional setting loadBalancerAttributes for IngressClassParams, to specify the ALB attributes to apply for all Ingresses of the IngressClass.

• If loadBalancerAttributes are defined, controller will configure all of the load balancers with the specified attributes. These attributes cannot be overridden via ingress annotations.
• Currently supported Load balancer attributes are listed in the AWS documentation.
• In case of the conflict attributes values for the Ingresses under the same ingress group, the controller will fail to reconcile.

Tests

1. Added unit tests.
2. Created IngressClass, IngressClassParams and Ingresses, verified the following circumstances:

• If both IngressClassParams and Ingress have the same attribute keys, but different attribute values, the controller will use the value from IngressClassParams to build the load balancers;
• If the attributes are only specified in IngressClassParams, the controller will configure the attributes to all the ALBs of the IngressClass;
• If there are conflicting attributes values for the Ingresses under the same ingress group, the controller will fail to reconcile.

Checklist

• Added tests that cover your change (if possible)
• Added/modified documentation as required (such as the README.md, or the docs directory)
• Manually tested
• Made sure the title of the PR is a good description that can go into the release notes

BONUS POINTS checklist: complete for good vibes and maybe prizes?! 🤯

• Backfilled missing tests for code in same general area 🎉
• Refactored something and made the world a better place 🌟

[k8s-ci-robot]

Hi @oliviassss. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[kishorj]

/ok-to-test

[codecov-commenter]

Codecov Report

Merging #2190 (d580df9) into main (a789f51) will increase coverage by 0.06%.
The diff coverage is 64.28%.

@@            Coverage Diff             @@
##             main    #2190      +/-   ##
==========================================
+ Coverage   52.29%   52.36%   +0.06%     
==========================================
  Files         132      133       +1     
  Lines        7234     7253      +19     
==========================================
+ Hits         3783     3798      +15     
- Misses       3157     3158       +1     
- Partials      294      297       +3     

Impacted Files	Coverage Δ
pkg/deploy/elbv2/load_balancer_synthesizer.go	41.37% <0.00%> (ø)
pkg/ingress/model_build_load_balancer.go	51.54% <50.00%> (+0.45%)	⬆️
...kg/ingress/model_build_load_balancer_attributes.go	69.56% <69.56%> (ø)

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[oliviassss]

/retest

[kishorj]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kishorj, oliviassss

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• OWNERS [kishorj]

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[stevehipwell]

Is there a timeframe for when this is likely to be released?