EKS pause container source is not consistent between hosts launched before/after v1.7.2

[jpculp]

What I'd like: When we decide to bump the version of the EKS pause container, we need to be mindful that hosts prior to v1.7.2 are set to {{ pause-prefix settings.aws.region }}/eks/pause-{{ goarch os.arch }}:3.1 while hosts launched post-v1.7.2 are set to {{ pause-prefix settings.aws.region }}/eks/pause:3.1-eksbuild.1.

Alternative solution: Create a migration to migrate Bottlerocket hosts still using pause-{{ goarch os.arch }}:3.1 to pause:3.1-eksbuild.1.