fix: aws registry encryptionConfiguration to be applied

[almoelda]

Modified the CreateRepositoryInput structure for ECR registry according to the configuration.
Added the a default value for the EncryptionType and validation for the KmsKey key.

fixes #598

[estahn]

@almoelda Can you check the tests?

[almoelda]

@estahn Apologies for that. I've added the new default of EncryptionType (AES256) to the repository tests.

[codecov]

Codecov Report

Attention: Patch coverage is 7.14286% with 13 lines in your changes missing coverage. Please review.

Project coverage is 27.79%. Comparing base (a086688) to head (f7721b4).
Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/registry/ecr.go	0.00%	10 Missing ⚠️
pkg/config/config.go	25.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #827      +/-   ##
==========================================
- Coverage   28.04%   27.79%   -0.26%     
==========================================
  Files          11       11              
  Lines        1041     1054      +13     
==========================================
+ Hits          292      293       +1     
- Misses        724      736      +12     
  Partials       25       25              

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