Allowing a Snapshot to not write to DB

[onufer]

What is the change?

Allow for Snapshot not to write to DB if db: false

Why is the change being made?

Sometimes (very rarely) snapshots are desired without writing a new DB. this supports that setting

https://github.com/terrapower/armi/pull/1783/files for more context

SCR Information

Change Type: features

One-Sentence Description: Allowing a Snapshot to not write to DB.

One-line Impact on Requirements: NA

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Checklist

• [x] This PR has only one purpose or idea.
• [ ] Tests have been added/updated to verify any new/changed code.
• [x] The code style follows good practices.
• [x] The commit message(s) follow good practices.
• [x] The documentation is still up-to-date in the doc folder.
• [x] The dependencies are still up-to-date in pyproject.toml.

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