Add regional registries

[d8660091]

Issue #, if available:

Description of changes: Add curated packages regional registries for beta stage.

Testing (if applicable):
Manual:

1. Set EKSA_AWS_* credential environment variables which has access to regional curated package registry
2. install packagecontroller eksctl-anywhere install packagecontroller
3. verified the regional registry were used for defaultImageRegistry, defaultRegistry fields of PackageBundleController
4. verified the packages controller were running healthy, and all its dependencies are healthy
5. manually installed hello package
6. verified the hello package was running healthy

Documentation added/planned (if applicable):

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[codecov]

Codecov Report

Patch coverage: 82.08% and no project coverage change.

Comparison is base (aef8f06) 75.62% compared to head (ae9837a) 75.62%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6681   +/-   ##
=======================================
  Coverage   75.62%   75.62%           
=======================================
  Files         473      474    +1     
  Lines       38265    38213   -52     
=======================================
- Hits        28937    28900   -37     
+ Misses       7728     7712   -16     
- Partials     1600     1601    +1     

Files Changed	Coverage Δ
pkg/curatedpackages/regional_registry.go	72.09% <72.09%> (ø)
pkg/curatedpackages/packagecontrollerclient.go	97.34% <100.00%> (+0.11%)	⬆️

... and 8 files with indirect coverage changes

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[cxbrowne1207]

Why aren't we return an error if the StatusCode is 404 here?

[d8660091]

the function only tests if the customer has the IAM policy, 404 means the customer has it, so 404 is good here

[cxbrowne1207]

Mind adding a comment explaining that? 404 typically means the server cannot find the requested resource, so this confused me a little.

[d8660091]

/approve

[eks-distro-bot]

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