Add support for BottlerocketFips AMI family in managed nodegroups

[amdonov]

Description

Adds support for the BottlerocketFips AMI family, enabling users to create
managed and self-managed nodegroups with FIPS-enabled Bottlerocket AMIs
(BOTTLEROCKET_x86_64_FIPS, BOTTLEROCKET_ARM_64_FIPS, and their Nvidia
variants).

Changes:

• Added NodeImageFamilyBottlerocketFips constant and registered it in
  SupportedAMIFamilies()
• Added AMI type mappings for all FIPS Bottlerocket variants (x86, ARM,
  Nvidia)
• Added SSM parameter resolution using the aws-k8s--fips path
  pattern for both self-managed and managed nodegroups
• Updated IsBottlerocketImage() to include the new family
• Replaced all hardcoded == NodeImageFamilyBottlerocket checks with
  IsBottlerocketImage() so that validation, defaulting, GPU support, volume
  naming, and bootstrapper selection all apply to the FIPS variant
• Removed the TODO exclusions in ssm_resolver_test.go that were tracking this
  gap

Usage:

managedNodeGroups:

• name: fips-ng
  amiFamily: BottlerocketFips
  instanceType: m5.xlarge
  desiredCapacity: 1

Checklist

• Added tests that cover your change (if possible)
• Added/modified documentation as required (such as the README.md, or the userdocs directory)
• Manually tested
• Made sure the title of the PR is a good description that can go into the release notes
• (Core team) Added labels for change area (e.g. area/nodegroup) and kind (e.g. kind/improvement)

BONUS POINTS checklist: complete for good vibes and maybe prizes?! 🤯

• Backfilled missing tests for code in same general area 🎉
• Refactored something and made the world a better place 🌟

[amdonov]

/kind feature
/area nodegroup

[naclonts]

Nice cleanups!