Add ansible lint and make it happy

[james-otten]

• Install collections from a new requirements.yml in the correct place. Has the side effect of pinning datadog.dd and cloud.terraform like we already did for k3s-ansible. Also makes that GH action a little cleaner.
• Run ansible-lint on PRs
• Make the linter happy
  • Rename various roles so their names contain _ not -
  • Remove some tailing whitespaces
  • Fix how templates and files are referenced
  • Set file perms for copied/templated files
  • Set names that start with capital letters
  • Line length
  • In one case, syntax (NODE_PORT)

Before merge:

• Merge Simplify dd logs setup #63
• Sanity check with dev