chore: Add some values to .gitignore

[james-otten-pan]

Description

Add some values to the .gitignore file to discourage some file types from being committed to this repo and forks.

Motivation and Context

Feel free to reach out offline.

How Has This Been Tested?

N/A

Screenshots (if appropriate)

N/A

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Checklist

• [x] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [x] I have added tests to cover my changes if appropriate.
• [x] All new and existing tests passed.

[welcome-to-palo-alto-networks[bot]]

:tada: Thanks for opening this pull request! We really appreciate contributors like you! :raised_hands:

[welcome-to-palo-alto-networks[bot]]

:tada: Congrats on getting your first pull request merged! We here at Palo Alto Networks are so grateful! :heart: