feat: Add a "aws-dotnet-deply" tag to ECR repositories that are created during deployment if an existing repository is not provided.

[ashovlin]

Issue #, if available: N/A, from internal discussion around #823

Description of changes: Adds the "aws-dotnet-deploy" tag to newly created ECR repositories. This will allow us to clean these up more easily after integration tests and canaries.

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 61.49%. Comparing base (48f29b1) to head (86ee738). Report is 9 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #825      +/-   ##
==========================================
+ Coverage   61.43%   61.49%   +0.06%     
==========================================
  Files         277      277              
  Lines       10659    10669      +10     
  Branches     1484     1486       +2     
==========================================
+ Hits         6548     6561      +13     
+ Misses       3571     3568       -3     
  Partials      540      540              

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