Fix pre-commit issues.

[Matthew-Grayson]

🗣 Description

Add exclude_paths to .ansible-lint for dependency files.

💭 Motivation and context

Closes issue #30
Per Fusion's request, I reverted the commented out hooks.
The exclude_paths values mean ansible-lint skips dependency files.
The packer_validate hook failure was solved locally by installing Packer. This is already a step in the startup script found in the cisagov development guide. It's an easy step to miss, especially for non-agency contributors.

🧪 Testing

Running precommit run --all-files passes for packer and ansible hooks.

✅ Pre-approval checklist

• This PR has an informative and human-readable title.
• Changes are limited to a single goal - eschew scope creep!
• All future TODOs are captured in issues, which are referenced
  in code comments.
• All relevant type-of-change labels have been added.
• I have read the CONTRIBUTING document.
• These code changes follow cisagov code standards.
• All relevant repo and/or project documentation has been updated
  to reflect the changes in this PR.
• Tests have been added and/or modified to cover the changes in this PR.
• All new and existing tests pass.

✅ Pre-merge checklist

• Revert dependencies to default branches.
• Finalize version.

✅ Post-merge checklist

• Create a release.

[nickviola]

LGTM

[ameliav]

Approved

[aloftus23]

looks good