feat: update .gitignore terraform/artifacts

[tintinhamans]

Summary of Pull Request

1. Updated .gitignore to correctly ignore .vmdk, .nvram, .ovf and .mf files.
2. Added tfplan files to .gitignore, also added additional ignores here to match the GitHub template.

Type of Pull Request

• This is a bugfix. type/bug
• This is an enhancement or feature. type/feature or type/enhancement
• This is a documentation update. type/docs
• This is a refactoring update. type/refactor
• This is a chore. type/chore
• This is something else.

Related to Existing Issues

Resolves #472

Test and Documentation Coverage

• Tests have been completed.
• Documentation has been added or updated.

Breaking Changes?

• Yes, there are breaking changes.
• No, there are no breaking changes.

[tenthirtyam]

LGTM! 🚀

[github-actions]

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