Add an option to disable empty commits to repositories

[joewesch]

Environment

• Nautobot version: 2.3.3
• nautobot-golden-config version: 2.1.2

Proposed Functionality

Add an option to disable pushing empty commits to repositories by checking if there are any changes to push before creating a commit message and pushing it up.

Use Case

When running the backup job on a set of devices that don't change very often, the repo git history can be full of useless empty commits. This can make it hard to narrow down a timeline of recent changes when looking at the git history of the repository as a whole.