feat: add support for calculating max pods when prefix assignment is …

[backjo]

…enabled

AWS recently released 1.9.0 of the AWS VPC K8S CNI, which adds support for prefix assignment. This PR
allows users who are using prefix assignment to have accurate max-pods calculations through the use of a new annotation on IGs.

https://github.com/aws/amazon-vpc-cni-k8s/releases/tag/v1.9.0

Signed-off-by: Jonah Back [email protected]

[codecov]

Codecov Report

Merging #326 (52e05b6) into master (2d0866e) will increase coverage by 0.05%.
The diff coverage is 100.00%.

❗ Current head 52e05b6 differs from pull request most recent head b963693. Consider uploading reports for the commit b963693 to get more accurate results

@@            Coverage Diff             @@
##           master     #326      +/-   ##
==========================================
+ Coverage   55.94%   56.00%   +0.05%     
==========================================
  Files          27       27              
  Lines        4020     4025       +5     
==========================================
+ Hits         2249     2254       +5     
  Misses       1629     1629              
  Partials      142      142              

Impacted Files	Coverage Δ
controllers/provisioners/eks/eks.go	89.13% <ø> (ø)
controllers/provisioners/eks/helpers.go	91.14% <100.00%> (+0.06%)	⬆️

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