Customize tinkerbell load balancer interface

[sp1999]

Issue #, if available:
#1954

Description of changes:
This PR introduces loadBalancerInterface as an optional configuration in the TinkerbellDatacenterConfig spec in order to allow customers to override the default interface used by the current load-balancer(kube-vip) daemonset for the Tinkerbell stack. It also updates the EKS-A docs for that and adds the corresponding design doc.

Testing (if applicable):

make eks-a
make lint
make unit-test
make generate
make generate-manifests
make release-manifests
make build-all-test-binaries
make verify-generate
make verify-generate-manifests

Successfully created and upgraded a tinkerbell cluster with a custom loadBalancerInterface specified in the cluster spec through the tinkerbell datacenter config

Documentation added/planned (if applicable):

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.66%. Comparing base (fe2dad6) to head (bd4a7fc).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8805   +/-   ##
=======================================
  Coverage   73.65%   73.66%           
=======================================
  Files         578      578           
  Lines       36610    36618    +8     
=======================================
+ Hits        26965    26973    +8     
  Misses       7919     7919           
  Partials     1726     1726           

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[sp1999]

/approve

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